2023 Annual OIB Monitoring Report w/ Appendices 04/23/2024

DRAFT: 2023 OCEAN ISLE BEACH SHORELINE
AND INLET
ANNUAL MONITORING REPORT
(CPE Photograph taken on January S, 2024)
PREPARED FOR
TOWN OF OCEAN ISLE BEACH, NC
PREPARED BY
COASTAL PROTECTION ENGINEERING OF NORTH CAROLINA, INC.
41
Cumv4t
PRGTECTIDN
ENGINEERING
APRIL 2024

2023 OCEAN ISLE BEACH SHORELINE AND INLET
ANNUAL MONITORING REPORT
ENGINEERING CERTIFICATION
This monitoring information is submitted in accordance with CAMA Permit No. 107-16, which
incorporates the Shoreline and Inlet Management Plan monitoring protocol submitted as part of
the February 2016 Final Environmental Impact Statement (FEIS). This report (main text) is being
certified in compliance with the applicable sections of 21 NCAC 56.1100.
CA
s ti
SEAL 9� -
048852 _
'9 • �NGINE��'• ��
qM F
TAT1P
April 23, 2024
Adam T. Priest, P.E. Date
NC P.E. No. 048852
This item has been digitally signed
and sealed by Adam T. Priest, P.E. on
the date adjacent to the seal.
Printed copies of this document are
not considered signed and sealed
and the signature must be verified
on any electronic copies.
Coastal Protection Engineering of North Carolina, Inc.
4308 Masonboro Loop Road
Wilmington, NC 28409
Engineering License Certificate #: C-2331
This sheet is not complete without the main text of the report listed above, and the report is not
complete without this sheet.

EXECUTIVE SUMMARY
In April 2022, the Town of Ocean Isle Beach's Shoreline Protection Project entailing the
construction of a terminal groin and associated accretion fillet along the eastern end of the island
was completed. Following completion of the project, the Town's Shoreline and Inlet Management
Plan (Plan) was initiated to monitor the performance of the project. The utility of the Plan was
designed to provide a baseline for assessing recent and future adverse impacts, and to determine
where any established thresholds become breached which could lead to the need to implement
mitigative action.
The terminal groin component of the project consisted of a 750-foot rubblemound structure and
a 300-ft shore anchorage section (to protect against flanking of the landward end of the structure).
As required by permit, an accretion fillet was also constructed along a 3,214-foot section of
oceanfront shoreline immediately west of the structure in conjunction with the Federal Coastal
Storm Risk Management (CSRM) project which involved the placement of beach fill to Goldsboro
St. (Station 80+00). The beach fill for the accretion fillet and the CSRM project was obtained from
the federally authorized and permitted borrow area within Shallotte Inlet. The volume quantities
provided by the USACE indicated that 272,936 cubic yards (cy) of beach fill was placed within the
footprint of the accretion fillet and an additional 484,211 cy of beach fill was placed to construct
the federal CSRM project.
The Plan includes the acquisition of beach profile survey data covering 27,000 feet of shoreline on
Ocean Isle Beach (0+00 to 270+00) and 10,000 feet of shoreline on the west end of Holden Beach
(300+00 to 400+00), radial profiles around the east (403+00 to 425+00) and west shoulders (-5+00
to-35+00) of Shallotte Inlet, hydrographic survey of the inlet, and the acquisition of aerial imagery
of the inlet area. The beach profiles, which are spaced at 500-foot intervals, are surveyed
approximately every six months (fall and spring) while the inlet radial profiles are surveyed once
each year during the spring. The aerial imagery is also acquired once each year during the spring.
Beach profile monitoring surveys were conducted by McKim & Creed in May 2023 and November
2023 and were used in this assessment to quantify the short-term and long-term shoreline and
volumetric changes and rates. Survey data collected in June 2022 serves as a baseline for
comparison with the November 2023 data to assess the long-term changes. The short-term
changes were determined by comparing the survey data collected in May 2023 and November
2023. Throughout this report, these two time periods will be referred to as the "long-term" and
"recent" monitoring periods in the report.
The May 2023 hydrographic survey data collected by McKim & Creed from within Shallotte Inlet
was used to document the post -construction condition of the borrow area, ebb shoal
configuration, and the main channel location. Aerial imagery collected by GeoNXS Solutions in
May 2023 was utilized to map the sand spit shoreline on the east and west shoulders of Shallotte
Inlet so that changes in the spit shoreline can be compared.
Page I i

The second annual monitoring cycle to monitor the shoreline / inlet changes at Ocean Isle Beach
and Holden Beach following the construction of the Ocean Isle Beach Shoreline Protection Project
(terminal groin and accretion fillet) and the 2022 federal CSRM project has been completed. The
data was used to evaluate linear shoreline and volumetric changes and assess the impact of the
Shoreline Protection Project using established thresholds to monitor the response of the
shorelines along the entirety of Ocean Isle Beach's oceanfront shoreline and the western 10,000
feet of Holden Beach's oceanfront shoreline as well as the inlet shorelines on the east and west
shoulders of Shallotte Inlet. Results of the 2023 annual monitoring have been discussed in terms
of recent (short-term) changes and long-term changes that occurred relative to the June 2022
baseline survey.
Overall, the 2023 monitoring results of the Ocean Isle Beach linear shoreline and volumetric
change analyses show that the East Beach segment experienced the most erosion during the
recent 6-month monitoring period, followed by the West Beach segment that also experienced a
trend of erosion during the recent 6-month monitoring period. The Central Beach and West End
segments experienced net accretion. The linear shoreline analysis indicated that the shoreline
advanced on average at the Mean High Water (MHW) position in all the segments during the
recent period, with the exception of the East Beach segment.
The long-term period (June 2022 to November 2023) indicated the same trends as the recent
period. Linear shoreline and volumetric change analyses indicated that the East Beach segment
experienced the most erosion. The West Beach segment also experienced erosion during the long-
term period. The Central Beach and West End segments accreted over the long-term period. The
linear shoreline analysis indicated that only the East Beach segment retreated at the MHW
position during the long-term period.
The shoreline threshold analysis results along the Ocean Isle Beach oceanfront shoreline indicate
that the post -construction shoreline change rates exceeded the established shoreline change
threshold for 2 of the 53 stations monitored, neither of which exceeded the threshold based on
the Year-1 monitoring results. The May 2023 wet/dry inlet shoreline, digitized from the May 2023
aerial image also revealed two locations along the OIB inlet shoreline where the established inlet
shoreline threshold was exceeded. The two areas where the inlet shoreline threshold was
exceeded are generally located in the same areas that were identified in the Year-1 report but
with a reduced alongshore and cross -shore extent. The areas are located along the interior inlet
shoreline of Ocean Isle Beach, adjacent to the Atlantic Intracoastal Waterway (AIWW), and along
an approximately 775 ft. section of the inlet shoreline immediately east of the terminal groin
structure. The inlet shoreline east of the structure has demonstrated a trend of erosion since
before the construction of the Shoreline Protection Project and this section of shoreline was less
eroded in March 1999 prior to construction of the initial 2001 federal CSRM project. Following
completion of the Shoreline Protection Project and the 2022 federal CSRM project, observations
have continued to show sand bypassing the terminal groin and being deposited in the area
immediately east of the structure. In addition, approximately 75,000 cy of navigation maintenance
material dredged from the Shallotte Inlet Crossing by the USACE was also placed just east of the
terminal groin (roughly between Stations -5+00 and-20+00) in February 2023. Continued
Page I ii

placement of the navigation maintenance material on the shoreline east of the terminal groin is
expected to moderate future erosion in the area.
On Holden Beach, the recent volume change rates (May 2023 to November 2023) along the
oceanfront shoreline indicated erosion at 14 of the 21 monitoring stations. However, the MHW
shoreline change rates indicated a shoreline advance at 16 of the 21 monitoring stations. The
long-term post -construction linear shoreline and volume changes along the Holden Beach
oceanfront shoreline indicated seaward advance and accretion, respectively. The shoreline
threshold analysis results along the Holden Beach oceanfront shoreline show that none of the
post -construction shoreline change rates measured at each monitoring station exceeded the
established shoreline change threshold. The analysis of aerial imagery showed the May 2023
wet/dry line representing Holden Beach's inlet shoreline showed an approximate 480 ft. section
exceeded the inlet shoreline threshold by an average of 30 feet. The inlet shoreline threshold on
Holden Beach was not exceeded in Year-1.
The areas on Ocean Isle Beach and Holden Beach where the post -construction oceanfront and
inlet shoreline changes exceeded the thresholds will be monitored over the 2-year confirmation
period. The Plan includes the establishment of a 2-year confirmation period to account for
possible short-term shoreline changes that could be caused by storm events or other factors. If
during the confirmation period the oceanfront and inlet shoreline changes where the thresholds
have been breached no longer exceed the thresholds, the 2-year confirmation period will be reset.
If the shoreline changes continue to exceed the thresholds over the entire 2-year confirmation
period, an assessment of the proper responsive measures will be made through coordination with
State and Federal regulatory officials. A summary of the 2023 shoreline and volume change
monitoring results and the shoreline change threshold analysis results are shown in Table ES-1.
Table ES-1. Summary of 2023 Monitoring Results for Ocean Isle Beach and Holden Beach
HoldenEast Beach Central Beach West Beach West End
Recent Period - May 2023 to November 2023
Avg. MHW Shoreline
Change (ft.)
12.6
3.2
8.3
44.3
6.7
Avg. Volume Change
(cy/ft.)
4.4
2.0
3.7
7.3
4.5
Long-term Period - June 2022 to November 2023
Avg. MHW Shoreline
Change (ft.)
-55.8
14.6
12.4
39.6
3.0
Avg. Volume Change
(cy/ft)
-14.8
5.4
-2.6
13.3
3.5
Shoreline Change Threshold Analysis
No. of Stations Shoreline
0/17
0/19
2/16 0/6
0/21
Threshold Exceeded
Note: Cells highlighted in red indicate negative changes while cells highlighted in green indicate positive changes.
Page I iii

DRAFT: 2023 OCEAN ISLE BEACH SHORELINE AND INLET
ANNUAL MONITORING REPORT
TABLE OF CONTENTS
1 INTRODUCTION...............................................................................................................................1
1.1 Project Location...............................................................................................................................1
1.1 Project Description...........................................................................................................................2
2 MONITORING plan..........................................................................................................................3
2.1 Notable Events.................................................................................................................................
9
3 Methodology.................................................................................................................................9
3.1 Shoreline Changes Analysis..............................................................................................................
9
3.2 Volumetric Change Analysis...........................................................................................................10
3.3 Establishment of Shoreline and Inlet Shoreline Thresholds...........................................................10
4 Results & Analyses.......................................................................................................................15
4.1 016 MHW Shoreline Change...........................................................................................................15
4.2 Holden Beach MHW Shoreline Change..........................................................................................18
5 Volume Analyses..........................................................................................................................20
5.1 01B Volumetric Change..................................................................................................................
20
5.2 Holden Beach Volumetric Changes................................................................................................
23
6 Project Impacts / Performance to date..........................................................................................25
6.1 Shoreline Change Threshold Analysis.............................................................................................
25
6.2 Inlet Shoreline Threshold Analysis..................................................................................................28
6.3 Hydrographic Survey of Shallotte Inlet...........................................................................................33
6.4 Annual Visual Inspection................................................................................................................35
7 Conclusions...................................................................................................................................36
8 References...................................................................................................................................39
Page I iv

LIST OF FIGURES
Figure 1. Project Location Map...............................................................................................................
Figure 2. OIB Shoreline Protection Project and the 2022 Federal CSRM Project Limits .........................
Figure 3. OIB and Holden Beach Annual Monitoring Beach Profiles......................................................
Figure 4. Shallotte Inlet Shoreline Monitoring Radial Profiles................................................................
Figure 5. Shallotte Inlet Hydrographic Survey Area................................................................................
Figure 6. OIB Shoreline Monitoring Segments........................................................................................
Figure 7. Holden Beach Shoreline Monitoring Segments.......................................................................
Figure 8. 95% Confidence Intervals for Ocean Isle Beach Monitoring Stations ......................................
Figure 9. 95% Confidence Intervals for Holden Beach Monitoring Stations ...........................................
Figure 10. Shallotte Inlet Shoreline Thresholds......................................................................................
Figure 11. OIB MHW Shoreline Change Comparison..............................................................................
Figure 12. Holden Beach MHW Shoreline Change Comparison.............................................................
Figure 13. OIB Annualized Volume Change Rates above -18 ft. NAVD88...............................................
Figure 14. Holden Beach Annualized Volume Change Rates above -18 ft. NAVD88 ..............................
Figure 15. Shoreline Change Rates on OIB..............................................................................................
Figure 16. Shoreline Change Rates on Holden Beach.............................................................................
Figure 17. Shallotte Inlet Shoreline Change Plot....................................................................................
Figure 18. Holden Beach Inlet Shoreline Change (in Feet).....................................................................
Figure 19. OIB Inlet Shoreline Change (in Feet)......................................................................................
Figure 20. Sediment Bypassing the Terminal Groin (July 10, 2023).....................................................
Figure 21. USACE Navigation maintenance material placed on the inlet shoreline, east of terminal
groin(Photo taken 2/22/23)....................................................................................................................
Figure 22. May 2023 Shallotte Inlet Hydrographic Survey Elevation Map .............................................
Figure 23. Terminal groin with footprint overlayed (imagery collected November 20, 2023)................
Figure 24. View of the top of the groin looking south (Photo taken November 20, 2023).....................
Table 1. Summary of Survey Events.........................................................................................................
Table 2. OIB Monitoring Segments..........................................................................................................
Table 3. Holden Beach Monitoring Segments..........................................................................................
Table 4. Recent Notable Events...............................................................................................................
Table 5. Summary of OIB Recent and Long -Term MHW Shoreline Changes ...........................................
Table 6. Summary of Holden Beach Recent and Long -Term MHW Shoreline Changes ..........................
Table 7. Summary of OIB Recent and Long -Term Volumetric Changes Above -18 ft. NAVD88 ..............
Table 8. Summary of Holden Beach Recent and Long-term Volumetric Changes Above -18 ft.
NAVD88.....................................................................................................................................................
Table 9. Shoreline Change Rate (FT/YR) Threshold Comparison.............................................................
APPENDICES
APPENDIX A: Comparative Beach Profile Plots for Ocean Isle Beach Monitoring Stations
APPENDIX B: Comparative Beach Profile Plots for Holden Beach Monitoring Stations
.1
.2
.4
.4
.5
.7
.8
12
13
14
16
20
23
24
27
28
29
30
31
32
32
34
35
36
.6
.6
.8
.9
15
18
21
24
25
Page I v

1 INTRODUCTION
This report is the second in a series of annual reports that describes the results of monitoring
initiatives that have been set forth to study the effects of the Town of Ocean Isle Beach's Shoreline
Protection Project which was constructed on the east end of Ocean Isle Beach between November
2021 through April 2022. The goal of the Plan is to:
1) Monitor the Ocean Isle Beach and Holden Beach oceanfront shorelines and east and west shoulders
of Shallotte Inlet to verify the anticipated response of the shorelines and inlet shoulders to the
effects of the Shoreline Protection Project (which included the construction of a terminal groin and
accretion fillet) and,
2) Provide data to track the performance of the Shoreline Protection Project to assess any potential
impacts as a result of the project on the adjacent shorelines.
Condition #20 within the Town's CAMA Major Permit No. 107-16 and Special Condition #34 within
the Town's Dept. of Army Individual Permit No. SAW-2011-01241 require the Town to conduct
post -construction monitoring along the entirety of Ocean Isle Beach's oceanfront shoreline, the
western end of Holden Beach, and the shorelines surrounding Shallotte Inlet as defined in the
Shoreline and Inlet Management Plan included within the Town's Final Environmental Impact
Statement (FEIS) dated February 23, 2016.
1.1 Project Location
The Town of Ocean Isle Beach is located on a coastal barrier island, approximately 29,200 feet (5.5
miles) long, along the Atlantic Ocean on the coastline of Brunswick County in southeastern North
Carolina (Figure 1).
Figure 1. Project Location Map
Page 1 1

Ocean Isle Beach is oriented generally in an east/west direction with a south facing oceanfront
shoreline. The island is separated from Holden Beach on the eastern tip by Shallotte Inlet and
from Sunset Beach on its western terminus by Tubbs Inlet. Barrier islands such as Ocean Isle Beach
are dynamic systems that erode and accrete depending on various factors such as storms, sea
level rise, their underlying geology, and shoreline stabilization efforts.
1.1 Project Description
The Ocean Isle Beach Shoreline Protection Project was constructed between November 2021 and
April 2022. The construction of the Shoreline Protection Project consisted of two components: a
terminal groin and an accretion fillet. The construction of the 1,050 ft. terminal groin component
of the project consisted of a 750-foot rubblemound structure and a 300-ft shore anchorage
section (to protect against flanking of the landward end of the structure). As required by permit,
an accretion fillet was also constructed along a 3,214-foot section of oceanfront shoreline
immediately west of the structure in conjunction with the construction of the Federal Coastal
Storm Risk Management (CSRM) project for the Town. The beach fill for the accretion fillet and
the CSRM project was obtained from the permitted borrow area within Shallotte Inlet. Volume
quantities provided by the United States Army Corps of Engineers (USACE) indicated that
approximately 757,000 cubic yards of beach fill was placed to construct both the accretion fillet
and the CSRM project (Stations 0+00 to 80+00). Figure 2 depicts the limits of the Ocean Isle Beach
Shoreline Protection Project and the federal CSRM project.
O
_
A
rrn
b
O
2
z
z
�_
Terminal Groin
70+00
60+00 I+ 50.00
~�
lei-kL. } ttoL .i.
i+-' 1 m
rr,.+ 1 .�. ...� �.r. .� j_ 40,4)0
-� -i
20+00
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0-
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clar
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4
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Accretion Fillet
Federal C5RM Project
„EM,
eF,�c rviLL +
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Figure 2. OIB Shoreline Protection Project and the 2022 Federal CSRM Project Limits.
Page 1 2

2 MONITORING PLAN
As stated in the Town of Ocean Isle Beach's Shoreline and Inlet Management Plan (Plan), the
Monitoring Plan includes the acquisition of beach profile survey data covering 27,000 feet of
shoreline on Ocean Isle Beach and 10,000 feet of shoreline on the west end of Holden Beach
(Figure 3), inlet radial profiles around the east and west shoulders of Shallotte Inlet (Figure 4),
hydrographic survey of the inlet (Figure 5), and the acquisition of aerial imagery. Beach profile
surveys, which are spaced at 500-foot intervals along the beach from the USACE baseline to a
distance of at least 2,500 ft. offshore or to a depth of approximately-30 ft. NAVD88, are performed
approximately every six months; once in the fall and once in the spring. The inlet radial profiles
and the hydrographic survey of Shallotte inlet and shoals are conducted once each year during the
spring. These surveys are supplemented with the acquisition of aerial imagery of the inlet area
and the terminal groin project area annually in the spring.
Performance of the Ocean Isle Beach and Holden Beach shorelines was determined based on an
analysis of linear shoreline changes and volumetric changes. Linear shoreline change was
measured at each station based on the position of the Mean High Water (MHW) (+1.8 ft. NAVD88)
contour during each survey event. Volumetric change was measured at each monitoring station
from the baseline seaward to a depth of -18 ft. NAVD88 during each survey. The survey data from
the inlet radial profiles was not used in the shoreline change or volumetric change analyses.
In addition to the linear shoreline change and volumetric change analyses, established shoreline
change thresholds for the Ocean Isle Beach and Holden Beach ocean -facing shorelines and
established inlet shoreline thresholds for the east and west shoulders of Shallotte Inlet were
developed to assess whether unanticipated shoreline changes occurred and could be attributed
to the construction of the Shoreline Protection Project. Additional details regarding these analyses
are discussed in the following sections.
In addition to the spring and fall beach profile monitoring surveys, the Plan also requires that a
hydrographic survey of Shallotte Inlet and the acquisition of high -resolution aerial imagery of the
Shallotte Inlet area is to be conducted during each spring event. The hydrographic survey limits
cover the area within the inlet from approximately Station 400+00 on Holden Beach to Station
0+00 on Ocean Isle Beach and from the confluence of the inlet with the AIWW seaward to the
-30-foot NAVD88 depth contour in the ocean. The hydrographic survey is used to document the
post -construction condition of the borrow area, ebb shoal configuration, and the main channel
location. The aerial images are used to help document changes to the extent of the shorelines on
the east and west shoulders of the inlet over time.
Page 1 3

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ILI
SHALLOTTE
INLET
418
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tiOLDEN BEACH

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50000N
Notes:
1. Coordinates are in feet based on the
North Carolina State Plane Coordinate
System, North American Datum of
1983 (NAD 83).
2. Background imagery collected on
2020-08-04 by NOAA and on
2022-05-26 by CPE.
ATLANTIC
©LEAN
Legend:
Holden Beach Monitoring Profiles
Ocean Isle Beach Monitoring Profiles
Shallotte Inlet Bathymetry Survey Area
,1
Figure 5. Shallotte Inlet Hydrographic Survey Area
1N
1
Feet
1,000 2,000
Page 1 5

Analysis of the beach profile survey data has been used to determine the recent and long-term
shoreline and volumetric changes as well as any erosional/accretional trends or patterns between
the surveys. Monitoring surveys used for the analysis described in this report were conducted by
McKim & Creed. Table 1 provides a summary of the survey events to date.
IdUlC I. JUfn[IIdlV UI JUIVCV CVCnLb
June 2022 (Baseline) -35+00 to 270+00 (OIB) and 300+00 to 425+00 (HB)
December 2022 0+00 to 270+00 (01B) and 300+00 to 400+00 (HB)
May 2023 -35+00 to 270+00 (016) and 300+00 to 425+00 (HB)
November 2023 0+00 to 270+00 (OIB) and 300+00 to 400+00 (HB)
Survey data collected in June 2022 serves as a baseline and is used to determine the long-term
changes within the monitoring areas. Recent changes are determined based on a comparison
between the May 2023 and November 2023 data. These two time periods will be referred to as
"long-term" and "recent" monitoring periods, respectively, in the report. Appendix A provides
comparative cross -sections of the June 2022, May 2023, and November 2023 monitoring survey
profiles. These profiles are predominately used to depict changes in the subaerial berm and
nearshore area and thus provide information on the entire beach cross-section to its point of
closure.
In order to capture spatial variations along the Town's oceanfront shoreline, the Ocean Isle Beach
monitoring area has been subdivided into five (5) segments based on shoreline and volumetric
change trends observed in the monitoring data. The segments, from east to west, are defined in
Table 2 and shown in Figure 6.
Table 2. 016 Monitoring Segments
OIB Inlet Radial profiles on west side of Shallotte Inlet shoreline -35+00 to -5+00
East Beach Eastern limit of oceanfront homes to Goldsboro Street 0+00 to 80+00
Central Beach Goldsboro Street to Sea Turtle Path 80+00 to 170+00
West Beach Sea Turtle Path to Schooner Drive 170+00 to 245+00
West End Schooner Drive to the end of Ocean Isle W Blvd 245+00 to 270+00
Page 1 6

as
� as
ae
a°
OIB Inlet
r�� e ttt
Shoreline
e hoelo
�, o a� Beach
,o Ce Str hoveWrie
�Sho ew%e
ed
West
SboreVx%%e I
Fee[
0 2.500 5,000
Figure 6. OIB Shoreline Monitoring Segments.
Beginning at the eastern limits of Ocean Isle Beach, the first shoreline segment is referenced as
"OIB Inlet" shoreline. This area is located along the Shallotte Inlet western shoreline and is
represented by profiles located between Stations -35+00 (near the end of the spit) through -5+00
(just east of the terminal groin). The shoreline within this segment is presently designated as an
Inlet Hazard Area (IHA) and was excluded from the shoreline change and volumetric analysis due
to the variable/erratic nature of the changes within the IHA. Survey data from within this area is
evaluated each spring based on an inlet shoreline threshold established within the Plan (shoreline
thresholds are discussed in greater detail in Section 3.3 below). The second shoreline segment,
designated as "East Beach", includes an approximate 8,000 ft. long extent of oceanfront shoreline
along the easternmost developed portion of Ocean Isle Beach between Stations 0+00 (adjacent to
the terminal groin) and 80+00 (Goldsboro Street). The shoreline within this segment encompasses
the terminal groin accretion fillet (Station 0+00 to Station 30+00) as well as the domain of the
2022 federal CSRM project that terminated at Station 80+00. The third shoreline segment is
referenced as the "Central Beach" and extends approximately 9,000 ft. between Stations 80+00
to 170+00 (Sea Turtle Path). This shoreline segment is also part of the extent of the template for
the federal CSRM project; however, this portion of the federal CSRM project has not required
maintenance since the project was initially constructed in 2001. The fourth shoreline segment
located immediately west of the federal CSRM project limits is referenced as the "West Beach".
This segment spans approximately 7,500 ft. between Stations 170+00 to 245+00 (near Schooner
Drive.). The fifth and final shoreline segment designated as "West End" spans approximately 2,500
Page 1 7

ft. long and is located at the western end of Ocean Isle Beach between Stations 245+00 and
270+00 in proximity to Tubbs Inlet.
The Holden Beach monitoring area is subdivided into two (2) segments. The first shoreline
segment on Holden Beach is referred to as the "HB Inlet" shoreline. This area is located along the
Shallotte Inlet eastern shoreline and is represented by profiles located at Stations 403+00 through
425+00. The shoreline within this segment is presently designated as an Inlet Hazard Area (IHA)
and is excluded from the shoreline change and volumetric analysis due to the variable/erratic
nature of the changes within the IHA. This area, however, is evaluated each spring based on an
inlet shoreline threshold established within the Plan. The second shoreline segment is located
directly to the west of HB Inlet and is designated as "Holden Beach". This segment spans
approximately 10,000 ft. and covers the westernmost developed portion of Holden Beach
between Stations 300+00 (Sailfish Street) and 400+00 (Ocean Blvd. W.). These two segments,
from east to west, are defined in Table 3 and shown in Figure 7.
Table 3. Holden Beach Monitoring Segments
HB Inlet Radial profiles on east side of Shallotte Inlet shoreline 403+00 to 425+00
Holden Beach Sailfish Street to end of Ocean Blvd W 300+00 to 400+00
At3x
Vim" W
O
p0-
W U5 O
o 0
ShorelineShoreline
Feet
0 1.250 2,500
Figure 7. Holden Beach Shoreline Monitoring Segments.
ZME

2.1 Notable Events
Natural and anthropogenic (man-made) factors can alter the "typical" hydrodynamic conditions
along the beach, either at a localized point or along the entire area being monitored. Major storm
events (i.e., nor'easters or hurricanes) can drastically alter the wind and wave conditions for a
short duration, however the impacts of such storms can be documented along the beach for long
periods of time. In addition, local construction and dredging projects have the potential to impart
both long and short-term signatures on the shoreline should they alter natural coastal processes.
Table 4 provides a list of notable events that have occurred during this monitoring period and,
where applicable, will be referred to throughout the report.
Table 4. Recent Notable Events
Dredging/Beach
Projects
Time Period
Dredging Area Fill Volume (placed on
Ocean Isle Beach)
Shallotte Inlet Crossing
February 2023
Fill material was placed on 016, east of Approx. 75,000' cy
Nay. Maint. Dredging
the terminal groin
Weather Events
Event
Time Period
Comments
The area was impacted by avg. wave heights of 2.7 ft. with a max.
Tropical Storm Idalia
Aug. 30 -Sept.
height of 7.5 ft. and an avg. period of 10.3 sec and a max period of
1, 2023
15 sec.
Sept. 21 - 23,
The area was impacted by avg. wave heights of 2.8 ft. with a max.
Tropical Storm Ophelia
2023
height of 4.6 ft. and an avg. period of 8.8 sec and a max period of
13 sec.
'Reported volumes were not included in the analysis and are for informational purposes only.
too 1aIIIS] 110]1toZel'1
3.1 Shoreline Changes Analysis
Linear shoreline change is calculated by comparing shoreline positions of the MHW contour (+1.8
ft. NAVD88) along shore perpendicular transects over time. This method was used to calculate
the recent shoreline changes between the May 2023 and November 2023 surveys in this report.
Although changes to the position of the shoreline (either landward or seaward) typically provides
a basic understanding of shoreline dynamics, it should be noted that shoreline change is not always
synonymous with volumetric change and therefore should not be the only metric used to evaluate
the performance of the project.
Long-term shoreline change rates computed for the Ocean Isle Beach and Holden Beach
monitoring areas were calculated using a linear regression (least squares analysis) method. This
method incorporates the determination of the slope of the linear trendline of the MHW shoreline
positions from the June 2022, December 2022, May 2023, November 2023 survey events. Both
the short-term and long-term rates are described in terms of positive (+) for advance (shoreline
Page 19

moving seaward) and negative (-) for recession (shoreline moving landward). The MHW contour
is typically a relatively more active contour due to its location and reflects short-term changes in
the beach due to daily tides and hydrodynamic conditions as well as the overall long-term
component of shoreline movement. Tracking this contour is useful as it provides a visualization of
the beach condition at discrete times and can be used to examine the seasonal component of
shoreline change.
It is important for the reader to note that although shoreline change can be an indicator of loss or
gain of beach width, the nature of sand movement in response to wave and water level conditions
makes shoreline position highly variable. The response to a beach due to storm conditions
typically results in a steepening of the beach slope near the water line and the seaward movement
of sand resulting in the formation of offshore sand bars. During calmer wave periods, the extent
of the beach often recovers as sand moves landward. Typically, the beach exhibits a steeper slope
and narrower dry sand beach in the winter; whereas the beach slope is less steep in the summer
and the dry beach is generally wider.
3.2 Volumetric Change Analysis
An analysis of volume change and rate of change at each profile has been performed to assess the
volume of sand above the -18 ft. contour (referenced to NAVD88) within the study area. The
change in volume along a profile, or averaged over multiple profiles, are provided in cubic yards
per linear foot. At times, this report also provides total volume in cubic yards measured between
profiles. These volumes are based on the average end area method; whereby the average volume
change between adjacent profiles is multiplied by the distance between those profiles. Volumetric
change rates are given in cubic yards per linear feet of shoreline per year. Recent changes were
measured between May 2023 and November 2023 (6-months); whereas the long-term changes
were based on changes between June 2022 and November 2023 (1.4-years). The volume rate of
change calculated at each monitoring station was also normalized to an annual rate used to
evaluate spatial changes.
3.3 Establishment of Shoreline and Inlet Shoreline Thresholds
As described in the Shoreline and Inlet Management Plan (CPE-NC, 2016), shoreline change rate
thresholds were established at each monitoring station along the oceanfront shorelines of Ocean
Isle Beach and Holden Beach. In order to assess the performance of the Shoreline Protection
Project and to identify potential impacts it may have had on the adjacent shorelines; the historic
oceanfront shoreline and inlet shoreline positions were evaluated to establish monitoring
thresholds. The establishment of the shoreline and inlet shoreline thresholds were determined
based on the long-term shoreline trends as well as the larger short-term shoreline fluctuations
that naturally occur. These thresholds have been used to assess whether the shoreline changes
measured between the baseline event (June 2022) and November 2023 exceed the threshold
values indicating changes that would not have been expected to occur under pre -project
conditions.
Page 1 10

Shoreline change rate thresholds were not established for the inlet radial monitoring stations
around the Shallotte Inlet's east and west shoulders (Figure 4), which are included in the area
presently designated as an Inlet Hazard Area. This is due to the inherent variability of the inlet
shorelines and the lack of definitive shoreline trends because of the dynamic fluctuations in
response to the natural changes of the inlet morphodynamics (i.e. offshore depths, ebb shoal
configuration, flood channel location). As discussed in greater detail below, shoreline locations,
as delineated from post -construction orthomosaic aerial imagery, were compared to pre -
construction inlet shoreline thresholds established for Ocean Isle Beach and Holden Beach.
Pre -construction Shoreline Change - Pre -construction shoreline change rates along the Ocean Isle
Beach oceanfront monitoring areas were computed using long-term shoreline position data from
surveys conducted between December 2001 and July 2021, a period that includes several severe
hurricanes and four maintenance events of the federal CSRM project. The initial federal CSRM
project was completed in May 2001. Along Holden Beach, the pre -construction shoreline change
rates were computed using long-term shoreline position data from surveys conducted at 1,000 ft.
intervals from January 2007 to April 2022 unlike the post -construction surveys that were
conducted at 500 ft-spaced intervals. Therefore, the pre -construction survey data was normalized
by averaging the rates of the adjacent 1,000 ft. monitoring stations. This was done to create an
"apples to apples" comparison of the pre -construction rates with the post -construction rates
which were calculated at 500 ft. intervals between the June 2022 and November 2023 monitoring
events. Using the historical survey data, pre -construction shoreline change rates were computed
at each monitoring station using a least squares analysis of the long-term shoreline position data.
In a least squares analysis, a "best fit" line is calculated that minimizes the historical data's
deviations from this fitted line, with the slope of the line representing the shoreline change trend
for that transect. A least squares fit was used to determine the best representative shoreline
change trend and to address the issue of natural variability inherent in historical data.
Shoreline Change Thresholds - When comparisons are made between the pre -construction (2001
to 2021) and post -construction June 2022 to November 2023 shoreline change rates for each
monitoring station, it is important to be able to determine whether changes in the rates can be
attributed to the project construction or if the changes are within the range of expected (normal)
variation as observed within the pre -construction period. To do so, regression statistics were
performed to establish the 95%-confidence limits of the pre -construction trend lines for each
oceanfront monitoring station on Ocean Isle Beach and Holden Beach, as shown in Figure 8 and
Figure 9. The 95%-confidence interval suggests that there is a 95% certainty that the trend line
rate, as determined by the least squares fit, is located within the upper and lower limits for each
monitoring station. The upper and lower threshold limits were computing by adding/subtracting
one-half of the 95% confidence interval from the pre -construction shoreline change rates. The
establishment of this 95% confidence interval has been the basis for the determination of the
shoreline change rate thresholds.
Page 1 11

Post -construction Shoreline Chonge Rates - The monitoring program measures short-term post -
construction changes (at approximately 6-month intervals) that were used to establish a long-term
post -construction trend. The long-term post -construction trend can then be compared to the
long-term pre -construction conditions to determine if thresholds have been exceeded at any given
monitoring station. As previously mentioned, a linear regression (least squares fit) was computed
for all the post -construction MHW shoreline data for the June 2022, December 2022, May 2023,
and November 2023 survey events. A three-point average was applied to the individual least
squares shoreline change rates that were measured at each station to smooth the data along the
monitoring areas, while maintaining the observed trends. This process accounts for natural
shoreline fluctuations that could be misidentified as project -induced. These longshore average
post -construction rates for each profile were then compared to the threshold rate for each station.
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—Least Squares Trend
95% Confidence (Upper) 95% Confidence (Lower)
Figure 8. 95% Confidence Intervals for Ocean Isle Beach Monitoring Stations.
Page 1 12

d 150
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USACE BASELINE STATIONS (FT)
Least Squares Trend 95%Confidence (Upper)—95% Confidence (Lower)
Figure 9. 95% Confidence Intervals for Holden Beach Monitoring Stations.
Shallotte Inlet Shoreline Thresholds - Changes in the position of the inlet shoreline on the east end
of Ocean Isle Beach (between Stations -5+00 and-35+00) and the west end of Holden Beach
(Stations 403+00 and 425+00) are highly variable and as such were not included in the shoreline
change threshold analysis. To assess the changes of the inlet shoreline on the east end of Ocean
Isle Beach, the March 1999 configuration of the sand spit, as shown in Figure 10, was established
as the threshold for this inlet shoreline. On the Holden Beach side of Shallotte Inlet, the
established inlet shoreline threshold, as shown in Figure 10, was based on the maximum shoreline
excursions that occurred between October 2005 and January 2013 and includes a 300-foot buffer
between the threshold and the ocean front structures.
Page 1 13

Figure 10. Shallotte Inlet Shoreline Thresholds.
To account for possible short-term shoreline changes that could be caused by storm events or
other natural factors resulting in an observed shoreline change rate in exceedance of the threshold
rate lower limit at any station, the Plan established a 2-year confirmation period to confirm the
observed trend. If the shoreline change rate exceeds the threshold rate over the entire 2-year
confirmation period, an assessment of the proper responsive measures will be made in
coordination with State and Federal regulatory officials. If, however, the shoreline change rate
decreases below the threshold rate during the confirmation period, the 2-year confirmation
period will be reset. Similar to the oceanfront shoreline change threshold analysis, if responses
along the inlet shorelines exceed the established inlet shoreline thresholds and continue to exceed
the thresholds throughout the 2-year confirmation period, an assessment of the proper
responsive measures will be made. However, if the inlet shoreline advanced waterward of the
established inlet shoreline threshold during the confirmation period, the 2-year confirmation
period would be reset. In the event the area is impacted by a catastrophic storm such as a
hurricane or nor'easter that causes major changes to the shoreline, subsequent shoreline changes
would likely exceed the thresholds for some time. Therefore, if after the 2-year post -storm
confirmation period, shoreline changes are still being impacted by the storm -induced changes and
some of the measured shoreline changes still exceed the thresholds, an assessment will be made
to determine if a new reference shoreline condition is needed to adequately evaluate potential
project induced shoreline impacts that occur following the storm.
Page 1 14

4 RESULTS & ANALYSES
4.1 0113 MHW Shoreline Change
The June 2022, December 2022, May 2023, and November 2023 positions of the MHW contour
(+1.8 ft. NAVD88) were analyzed along the oceanfront shoreline of Ocean Isle Beach to assess
shoreline change. The shoreline change within the OIB Inlet segment (Stations -35+00 to -5+00)
was excluded from the shoreline change analysis due to the variable/erratic nature of the changes
within the Inlet Hazard Area. A summary of the recent and long-term average MHW changes and
annualized change rates for each shoreline segment between the survey events is provided in
Table 5 and shown graphically in Figure 11. Cross section plots comparing the profiles surveyed
in June 2022 (Baseline), May 2023, and November 2023 are included in Appendix A.
Table 5. Summary of 0113 Recent and Long -Term MHW Shoreline Changes
East Beach Central Beach West Beach West End
Parameters
Recent Period - May 2023 to November 2023
Avg. Change
(ft)
12.6
3.2
8.3
44.3
Avg. Change Rate
(ft./yr.)
25.1
6.4
16.5
88.7
Long-term Period - June 2022 to November 2023
Avg. Change
(ft.)
-55.8
14.6
12.4
39.6
Avg. Change Rate
(ft./yr.)
-43.9
8.2
8.2
24.2
East Beach— This shoreline segment is representative of the area where beach fill was placed as
part of the Ocean Isle Beach Shoreline Protection Project and the 2022 federal CSRM project. The
first monitoring report drafted in 2022 indicated the position of the MHW contour moved seaward
by an average of 194.1 ft. based on the federal CSRM project pre- and post -construction surveys.
A comparison of the post -construction beach fill survey and the first monitoring survey conducted
in June 2022 indicated the position of the MHW shoreline receded landward an average distance
of -30.3 ft. within the East Beach segment.
When comparing the May 2023 and November 2023 surveys to determine the recent changes,
the data clearly show the position of the MHW contour advanced an average distance of 12.6 ft.,
in the area where fill was placed in 2022 during this time period, as depicted in Figure 11. The
analysis of the data from May 2023 to November 2023 indicates that the recent shoreline change
is equivalent to a rate of 25.1 ft./yr. over the recent 6-month monitoring period. The changes
measured within this segment varied from a landward movement of 22.2 ft. at Station 75+00 to a
seaward movement of 37.2 ft. at Station 25+00. The rates measured during the recent period in
this segment are likely influenced by the seasonal variation in the beach profiles between the
monitoring events and the on -going equilibration of the post -construction shoreline.
Page 1 15

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--Long-term Period (June 2022 to November 2023) Recent Period (May 2023 to November 2023)
Figure 11. 01B MHW Shoreline Change Comparison.
The long-term changes (between the June 2022 (Year-1) baseline survey and the November 2023
(Year-2) survey), suggest that the East Beach segment receded during this time period as depicted
in Figure 11. The position of the MHW contour receded an average distance of 55.8 ft., which is
equivalent to a rate of -43.9 ft./yr. over the 1.4-year monitoring period. The changes measured
within this segment varied from a landward movement of 63.7 ft./yr. at Station 70+00 to a
landward movement of 12.5 ft./yr. at Station 70+00. The average recession rate measured during
the long-term period (-43.9 ft/yr.) is likely attributed to the continued equilibration of the post -
construction shoreline following the construction of the terminal groin project and the 2022
federal CSRM project. The long-term rate has decreased since December 2022 when the rate was
-53.9 ft./yr.
Centra/Beach—The short-term analysis indicates that the position of the MHW contour advanced
an average distance of 3.2 ft., which is equivalent to a rate of 6.4 ft./yr. (seaward movement) over
the 6-month monitoring period. The changes measured within this segment varied from a
seaward movement of 45.6 ft. at Station 110+00 to a landward movement of 38.7 ft. at Station
150+00. Two distinct short-term trends were observed within this segment of the beach. The
eastern 4,500 ft. of the segment, between Mt. Olive St. and Wilmington St. (Station 85+00 to
Page 1 16

Station 125+00) showed a positive change (seaward movement) of 18.5 ft. on average. In contrast,
the western 4,500 ft. of the segment, measured an average change of-10.4 ft. (landward
movement) between Wilmington St. and Sea Turtle Path (Station 130+00 to Station 170+00).
Similar to the Year-1 monitoring results, the results appear to indicate a change in the shoreline
response in the vicinity of the pier located between Stations 140+00 and 145+00, as indicated by
the black solid line in Figure 11. It should be noted that no fill was placed in the Central Beach
shoreline segment as part of the Ocean Isle Beach Shoreline Protection project and the 2022
federal CSRM project; however, it is likely that some of the fill placed at the western end of the
CSRM project has migrated into the eastern portion of this shoreline segment.
The long-term analysis indicates that the position of the MHW contour advanced an average
distance of 14.6 ft., which is equivalent to a rate of 8.2 ft./yr. (seaward movement) over the 1.4-
year (17-month) monitoring period. The changes along this segment varied between the beach
east of the Ocean Isle Beach pier and west of the pier. The results show that the shoreline east of
the pier experienced predominantly positive changes (seaward movement) in the position of the
MHW contour during the 6-month monitoring period, between Goldsboro St. and the Ocean Isle
Beach Pier (Station 80+00 to Station 140+00), whereas west of the pier, the results show negative
changes (landward movement) between Clinton St. and Oxford St. (Station 150+00 to Station
155+00), and positive changes from Troy St. to Sea Turtle Path (Station 160+00 to Station 170+00).
The data appears to indicate a change in the shoreline response to the vicinity of the pier structure
located between Stations 140+00 and 145+00. Figure 11 clearly shows the change in the shoreline
trend from positive to negative in proximity of the Ocean Isle Beach pier as indicated by the black
solid line. The changes measured within this segment varied from a landward movement of -19.3
ft. at Station 80+00 to a seaward movement of 39.9 ft. at Station 165+00.
West Beach — The analysis of the data comparing the May 2023 to November 2023 surveys
indicate that on average, throughout the entire segment, the position of the MHW contour
advanced seaward an average distance of 8.3 ft., which is equivalent to a rate of 16.5 ft./yr.
(seaward movement). The changes along this segment show the shoreline fluctuated between
seaward and landward movements along the 7,500 ft. segment. The eastern 4,500 ft. generally
experienced a seaward movement averaging 17.5 ft. between Station 170+00 and Station 215+00.
The next 2,500 ft. of shoreline in this segment migrated landward by an average of 11.6 ft. since
the May 2023 survey between Station 215+00 and Station 240+00. The westernmost profile
(Station 245+00) shows the shoreline advanced seaward a distance of 16.9 ft. during the
monitoring cycle.
The analysis of the long-term shoreline position in this segment showed the location of the MHW
contour fluctuated between positive and negative changes but generally followed a similar trend
as the changes during recent period. The results indicate that from June 2022 to November 2023
the position of the MHW shoreline within this segment on average experienced net seaward
movement of 12.4 ft., which represents an average rate of +8.2 ft./yr. The changes measured
within this segment varied from a seaward advance of 64.9 ft. at Station 190+00 to a landward
movement of 28.7 ft. at Station 230+00 as shown in Figure 11.
Page 1 17

West End —The analysis of the recent period changes along the West End segment indicated that
on average, throughout the entire segment, the position of the MHW contour advanced seaward
an average distance of 44.3 ft., which is equivalent to a rate of 88.7 ft./yr. (seaward movement).
The changes along this 2,500 ft. segment show the shoreline experienced advances at the MHW
contour at all of the monitoring stations during the recent 6-month period with the exception of
Station 255+00 that receded a distance of 10.7 ft. as shown in Figure 11. The greatest change
occurred at Station 265+00, advancing a distance of 83.9 ft. between May and November 2023.
The analysis of the long-term changes along the West End segment indicated a net advance of the
shoreline, following a trend similar to the recent period. The monitoring data indicates the
average MHW shoreline advanced seaward an average distance of 39.6 ft. between the June 2022
and November 2023 surveys. Expressing this change in an annualized format correlates to an
annual average rate of +24.2 ft./yr. The changes measured within this segment were all positive
with seaward advances of the MHW position ranging from +0.8 ft. at Station 255+00 to +80.5 ft.
at Station 260+00 as shown in Figure 11. The changes in this segment are likely influenced by the
dynamic fluctuations of Tubbs Inlet in response to the natural changes of the inlet
morphodynamics (i.e., offshore depths, ebb shoal configuration, flood channel location).
4.2 Holden Beach MHW Shoreline Change
The June 2022, December 2022, May 2023, and November 2023 positions of the MHW contour
(+1.8 ft. NAVD88) were analyzed along the ocean shoreline of Holden Beach to assess the shoreline
changes. The shoreline change within the HB Inlet segment (Stations 403+00 to 425+00) was
excluded from the shoreline change analysis due to the variable/erratic nature of the changes
within the Inlet Hazard Area. A summary of the recent and long-term average MHW changes and
annualized change rates for each shoreline segment between the survey events is provided in
Table 6. Cross section plots comparing the profiles surveyed in June 2022 (Baseline), May 2023,
and November 2023 are included in Appendix A.
Table 6. Summary of Holden Beach Recent and Long -Term MHW Shoreline Changes
Holden
Parameters (300+00-400+00)
Recent Period - May 2023 to November 2023
Avg. Change
6 7
(ft.)
Avg. Change Rate
-13.3
(ft./yr.)
Long-term Period - June 2022 to November 2023
Avg. Change
3.0
(ft.)
Avg. Change Rate
1.9
(ft./yr.)
Page 1 18

The analysis of the recent results comparing the May 2023 to November 2023 surveys indicate
that on average, throughout the nearly 2-mile-long Holden Beach oceanfront shoreline segment,
the position of the MHW contour receded an average distance of 6.7 ft., which is equivalent to a
rate of-13.3 ft./yr. (landward movement). The changes measured within this segment varied from
an advance of the MHW shoreline of 31.8 ft. at Station 300+00 to a seaward movement of -59.8
ft. at Station 400+00, the nearest station to Shallotte Inlet. The changes at each station along the
shoreline, as seen in Figure 12, fluctuated between seaward and landward movements along the
10,000 ft. segment with a general trend of increased shoreline recession from east to west with
greatest landward movement closest to Shallotte Inlet during the recent period (May 2023 and
November 2023). The eastern 5,000 ft. generally experienced a seaward movement averaging 7.7
ft. between Station 300+00 and Station 350+00, while the western 5,000 ft. of shoreline in this
segment migrated landward by an average of 21.3 ft. since the May 2023 survey between Station
350+00 and Station 400+00.
The analysis of the long-term results from June 2022 to November 2023 shows that the position
of the MHW shoreline varied during the 1.4-year period with a general trend of increased
shoreline recession from east to west, but on average advanced a distance of 3 ft. (seaward
movement), which represents an average rate of +2.1 ft./yr. (seaward movement) over the long-
term monitoring period. The changes measured within this segment varied from a seaward
movement of 46 ft. at Station 325+00 to landward movement of -79.3 ft. at Station 400+00 to as
shown in Figure 12. An examination of the profile plots shows the two westernmost profiles at
Stations 395+00 and 400+00 experienced the most recession which was related to increased
erosion of the beach face in November 2023, compared to June 2022. The increased retreat at
these stations is most likely attributable to natural changes of the inlet morphodynamics (i.e.
offshore depths, ebb shoal configuration, flood channel location) of Shallotte Inlet.
Page 1 19

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USACE BASELINE STATIONS (FT)
--Long-term Period (June 2022 to November 2023)
—Recent Period (May 2023 to November 2023)
Figure 12. Holden Beach MHW Shoreline Change Comparison.
5 VOLUME ANALYSES
As discussed in the previous section, changes in the shoreline position represented by a single
elevation contour can vary considerably based on sea conditions leading up to the time in which
the surveys were conducted. Sand on the beach is distributed by wind and wave action over the
entire active profile. The dry beach often observed above the water represents only a fraction of
the active beach profile. Therefore, the volume of sand measured on the entire active profile is
an important parameter to track to gauge the health of the beach.
5.1 OIB Volumetric Change
As previously stated, the shoreline within the Shallotte Inlet shoreline segments is designated as
an Inlet Hazard Area (IHA) and was excluded from the volumetric analysis due to the
variable/erratic nature of the changes within the IHA. Overall, the results of analysis of the recent
data set (May 2023 and November 2023) from the oceanfront shoreline segments along Ocean
Isle Beach demonstrates a net volume loss throughout the East Beach and West Beach segments
and a net volume gain in the Central Beach and West End segments. As for the analysis of the
Page 1 20

long-term data sets (June 2022 to November 2023), the results depict a net loss of volume
throughout the East Beach and West Beach segments, whereas the Central Beach and West End
segments experienced net volume gains. Table 7 provides a summary of the volumetric changes
calculated for each of the monitoring segments above -18 ft. NAVD88. The following sections
describe the volumetric changes within each of the four (4) subsegments along Ocean Isle Beach.
Table 7. Summary of 016 Recent and Long -Term Volumetric Changes Above -18 ft. NAVD88
East Beach Central Beach West Beach West End
Parameters
Recent Period - May 2023 to November 2023
Average Change
-4.4
2.0
-3.7
7.3
(cy/ft.)
Avg. Change Rate
(cy/ft./yr.)
8.8
3.9
-7.4
14.6
Total Volume
(cy)
-30,800
20,500
-28,100
21,500
Long-term Period - June 2022 to November 2023
Average Change
(cy/ft.)
-14.8
5.4
-2.6
13.3
Avg. Change Rate
-10.4
3.8
-1.8
9.4
(cy/ft./yr.)
Total Volume
(cy)
-114,000
52,800
-16,200
29,800
East Beach- Based on the volumetric analysis performed by the USACE, approximately 757,000
cubic yards of beach fill was placed between the terminal groin and Goldsboro St. (Station 0+00
to Station 80+00) between February and March 2022 as a result of the construction of both the
accretion fillet and the federal CSRM project. Between the post -construction survey and June
2022, a loss of approximately 49,000 cy was measured in this segment. This loss equates to an
average rate of -20.9 cy/ft./yr. Higher than normal erosion rates are to be expected as the
shoreline equilibrates following the beach fill placement that was completed in March 2022.
Analysis of the short-term survey data (May 2023 to November 2023) indicated a negative trend
with volume losses on all but four (4) stations (Stations 25+00, 60+00, 65+00, and 70+00), as
depicted in Figure 13. The changes across the entire segment resulted in an average loss of 4.4
cy/ft., which is equivalent to an average erosion rate of -8.8 cy/ft./yr. The volume losses ranged
from -17.5 cy/ft. at Station 0+00 to 5.0 cy/ft. at Station 60+00. Overall, there was a net volumetric
loss of approximately 30,800 cy above the -18 ft. NAVD88 contour. The losses were the greatest
in the eastern 2,000 ft. (Station 0+00 to Station 20+00) of this segment closest to the groin. The
average volume loss in this area was -11.0 cy/ft.
The volumetric analysis of the long-term changes shows the East Beach segment has maintained
a net loss of volume since June 2022 with an annual average rate of -10.4 cy/ft./yr. All the rates
were negative during this time period and varied between -3.8 cy/ft./yr. (Station 15+00) and -25.8
cy/ft./yr. (Station 0+00). A review of the results at each profile provided in Figure 13 shows a
Page 1 21

hotspot of higher erosion between Station 30+00 to Station 55+00 where the average rate was -
13.3 cy/ft./yr.
Central Beach — Analysis of the short-term data set revealed a net positive change of 2.0 cy/ft.,
which equates to a rate of 3.9 cy/ft./yr. within this segment. The volume changes measured
ranged from a gain of 9.8 cy/ft. at Station 115+00 to a loss of -5.2 cy/ft. at Station 130+00 as shown
in Figure 13. The overall results determined a net volumetric gain along this segment of
approximately 20,500 cy above -18 ft. NAVD88. It should be noted that no fill associated with the
Ocean Isle Beach Shoreline Protection Project or the 2022 federal CSRM project was placed in the
Central Beach shoreline segment during this time period.
The volumetric analysis of the long-term changes (June 2022 to November 2023) shows the
Central Beach segment has maintained a net positive volume since June 2022, averaging 5.4 cy/ft.
and equivalent to an annual average rate of 3.8 cy/ft./yr. (accretion) over the 1.4-year period. All
the rates were positive during this time period except at Station 120+00 (-0.7 cy/ft./yr.).
West Beach —The West Beach section experienced a net loss averaging 3.7 cy/ft., equivalent to an
overall erosion of approximately 28,100 cy (-7.4 cy/ft./yr.) during the short-term 6-month period.
Each monitoring station experienced losses during this time with values ranging from -18.1 cy/ft.
at Station 240+00 to +10.0 cy/ft. at Station 200+00 (Figure 12). The western 3,000 feet of this
segment (Station 215+00 to Station 245+00) experienced high negative volume changes averaging
-10.3 cy/ft. The rates of change within the eastern 4,500 feet (Station 170+00 to Station 215+00)
of this beach segment varied considerably, but the overall average was a relatively stable 0.7 cy/ft.
The volumetric analysis of the long-term changes for the West Beach segment shows that the
eastern portion of the segment between Stations 170+00 and 210+00 (between Sea Turtle Path
and west end of W 2nd St.) experienced a moderate positive change (3.3 cy/ft./yr.) in contrast to
higher erosion (-7.2 cy/ft./yr.) documented along the western portion between Stations 210+00
and 245+00 (between the west end of W 2nd St. and Schooner Dr.). Overall, the average annual
long-term volumetric change between June 2022 and November 2023 indicated modest erosion
at a rate of -1.8 cy/ft./yr. This computes to a net loss of 16,200 cy of sand since June 2022.
West End —The analysis of the short-term data sets (May 2023 and November 2023) indicate that
the West End experienced a net gain of 7.3 cy/ft. of sand, equivalent to a gain of approximately
21,500 cy above the -18 ft. NAVD88 contour. A profile -by -profile analysis shows that the driver of
this net gain of sand within the segment is attributed to the large gain of 32.7 cy/ft. at Station
265+00.
The volumetric analysis of the long-term changes (June 2022 to November 2023) shows the West
End segment has experienced a net positive volume since June 2022, averaging 13.3 cy/ft. and
equivalent to an annual average rate of 9.4 cy/ft./yr. over the 1.4-year period. It should be noted
that the behavior of this beach segment is likely being influenced by the dynamic nature of Tubbs
Inlet which is located directly to the west of this shoreline segment.
Page 1 22

12041
West West Central East
End Beach Beach Beach
y
�^ 100
L
0
L
7
L
�
~ 80
_
C
Ocean Isle
60
Beach Pier
o
M
LL 40
}
vL1
u
w
Q 20
s
w
Z 0
€
a
x
Lu
-20
D
J
-40
-60
-80
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e 0 O e 61 66 O e 6" " e O 6" 61 O O O" 61 O e 6 R" e 0 e 0 6" e
_y3 _i` _)`; -0
#
tiA ti� 1ti 1y 1� ,y1 _y 19 yo
USACE BASELINE STATIONS (FT)
--Long-term Period (June 2022 to November 2023) —Recent Period (May 2023 to November 2023)
Figure 13. CIB Annualized Volume Change Rates above -18 ft. NAVD88.
5.2 Holden Beach Volumetric Changes
The volumetric analysis of the recent changes, as shown in Table 8, indicate the Holden Beach
segment has experienced erosion with an average net loss of 4.5 cy/ft. above the -18 ft. NAVD88
contour over the 6-month period, resulting in an annual average rate of -9.1 cy/ft./yr. The
volumetric change along the segment varied, with the easternmost 2,000 ft. experiencing erosion
(-2.9 cy/ft.), while the next 3,500 ft. of shoreline experienced volume gains (5.1 cy/ft.), followed
by the highest losses along the western 4,500 ft. of shoreline (-12 cy/ft.), closest to Shallotte Inlet.
A review of the results shows the majority of the volume loss occurred on the deeper portion of
the profiles between the -8 ft. and -18 ft. NAVD88 contours, with the highest losses occurring on
the profiles west of Station 355+00, which are the profiles closest to Shallotte Inlet as shown in
Figure 14, which depicts the annualized volume change rates.
The volumetric analysis of the long-term changes (June 2022 to November 2023) shows the
Holden Beach segment has experienced a net volume gain of 3.5 cy/ft of sand since June 2022
resulting in an annual average rate of +2.5 cy/ft./yr. over the 1.4-year period. The total volume
gained during this period was 29,100 cy. It should be noted that this segment borders Shallotte
Page 1 23

Inlet and the changes observed during the recent and long-term periods may be influenced by the
dynamic changes associated with Shallotte Inlet.
Table 8. Summary of Holden Beach Recent and Long-term Volumetric Changes Above -18 ft. NAVD88.
HoldenParameters
(300+00-400+00)
Recent Period - May 2023 to November 2023
Average Change
-4.5
(cy/ft.)
Avg. Change Rate
9 1
(cy/ft./yr.)
Total Volume
-45,100
(cy)
Long-term Period - June 2022 to November 2023
Average Change
3.5
(cy/ft.)
Avg. Change Rate
2.5
(cy/ft./yr.)
Total Volume
29,100
(cy)
01 40
10
LL 0
u
-10
Q
a
W
W -20
Z
Q
W -30
M
J
Q -40
-50
-60
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
O Ln 0 V7 0 V1 0 LI1 0 � O Ln O Ln O V1 O V1 0 Ln 0
M m m m m m m m m m m m m m m m m m mm mm
USACE BASELINE STATIONS (FT)
Long-term Period (June 2022 to November 2023) —Recent Period (May 2023 to November 2023)
Figure 14. Holden Beach Annualized Volume Change Rates above -18 ft. NAVD88.
Page 1 24

6 PROJECT IMPACTS / PERFORMANCE TO DATE
6.1 Shoreline Change Threshold Analysis
The shoreline change thresholds are based on 95% confidence intervals established around the
computed pre -construction shoreline change trends for both Ocean Isle Beach and Holden Beach.
The shoreline change threshold upper and lower rates were determined by adding/subtracting
one-half of the 95% confidence interval from the pre -construction shoreline change rate
established for each monitoring station. The threshold lower rates are used to determine if the
post -construction shoreline change rates has been influenced by the construction of the Shoreline
Protection Project (terminal groin) or if is the rates are within the range of expected normal
variation for the pre -construction period.
Table 9 provides the pre -construction shoreline change rates for the Ocean Isle Beach and Holden
Beach oceanfront monitoring stations, the rates representing the shoreline change threshold
lower limits, and the long-term (June 2022 to November 2023) post -construction shoreline change
rates and the post -construction longshore average rates (3-point average). Stations where the
post -construction shoreline change rate exceeded the lower threshold limit are bolded and the
corresponding values are shaded. Figure 15 and Figure 16 show the long-term (pre -construction)
change rates (black solid line), upper and lower shoreline thresholds (black dashed lines),
compared to the June 2022 to November 2023 post -construction longshore average (3-point
average) shoreline change rates.
Table 9. Shoreline Change Rate (FT/YR) Threshold Comparison
June 2022 to November 2023
•Monitoring Station Pre -Construction Shoreline Change .
ThresholdLongshore Average Lower Limit Shoreline Change Longshore
Rates
OCEAN ISLE BEACH
0+00
-9.2
-102.3
-48.9
-
5+00
-7.9
-94.1
-57.9
-49.5
10+00
-9.6
-91.8
-41.8
-43.8
15+00
-8.7
-92.0
-31.7
-39.7
20+00
-8.3
-96.6
-45.8
-39.8
25+00
-11.1
-92.4
-42.1
-47.3
30+00
-11.8
-88.9
-54.0
-51.1
35+00
-10.9
-83.5
-57.4
-52.5
40+00
-10.3
-76.5
-46.2
-55.7
45+00
-9.3
-71.0
-63.7
-55.8
50+00
-8.1
-59.2
-57.6
-55.5
55+00
-5.2
-47.6
-45.1
-43.8
60+00
-4.3
-42.5
-28.6
-38.5
65+00
-5.1
-36.6
-41.9
-27.7
70+00
-5.6
-36.0
-12.5
-32.3
75+00
-4.7
-36.4
-42.6
-23.8
80+00
-4.3
-37.7
-16.5
-18.4
85+00
-5.8
-39.4
3.9
-3.2
90+00
-6.6
-40.1
2.8
-1.1
11 95+00
-6.8
1 -39.3
1 -9.9
1 -4.9
Page 1 25

Station
Pre -Construction
Longshore Average
Shoreline Change
ThresholdMonitoring
Lower Limit
June 2022 to November
•.
Shoreline Change
Rates
2023
Longshore Average
100+00
-6.7
-37.6
-7.5
-7.9
105+00
-7.3
-38.6
-6.2
-3.1
110+00
-6.7
-36.2
4.5
-1.8
115+00
-5.5
-35.8
-3.6
3.1
120+00
-7.0
-33.7
8.5
8.5
125+00
-7.3
-33.8
20.6
15.2
130+00
-8.2
-37.3
16.6
19.3
135+00
-7.3
-33.1
20.8
22.8
140+00
-6.7
-31.0
31.1
22.2
145+00
-4.6
-26.3
14.6
17.0
150+00
-3.1
-23.5
5.4
6.5
155+00
-2.1
-22.5
-0.5
4.3
160+00
-3.0
-21.5
8.0
12.5
165+00
-0.4
-12.9
30.0
23.2
170+00
-1.2
-17.6
31.5
31.8
175+00
-1.9
-21.7
33.8
30.3
180+00
-1.6
-20.0
25.6
26.9
185+00
0.1
-20.7
21.1
30.6
190+00
1.4
-19.0
45.2
33.4
195+00
0.4
-16.8
33.9
31.1
200+00
1.7
-19.8
14.2
18.4
205+00
2.4
-22.3
7.2
11.3
210+00
2.2
-21.1
12.4
7.4
215+00
2.7
-20.3
2.5
1.4
220+00
2.0
-16.6
-10.8
-5.0
225+00
1.9
-20.5
-6.8
-14.1
230+00
1.5
-17.5
-24.7
-19.3
235+00
0.8
-18.0
-26.3
-20.6
240+00
-0.1
-21.2
-10.9
-14.7
245+00
0.0
-21.0
-7.0
1.5
250+00
-0.5
-24.3
22.3
5.9
255+00
-2.8
-40.1
2.4
22.5
260+00
-3.3
-38.1
43.0
27.8
265+00
-6.8
-65.6
37.9
38.3
270+00
-11.9
-104.7
33.9
-
HOLDEN BEACH
300+00
7.1
-30.8
21.8
-
305+00
6.9
-29.3
12.9
11.5
310+00
6.7
-27.7
-0.3
5.4
315+00
6.4
-27.8
3.5
11.4
320+00
6.1
-28.0
31.1
22.2
325+00
6.3
-30.5
31.9
25.1
330+00
6.5
-33.0
12.3
10.8
335+00
5.9
-28.6
-11.8
6.7
340+00
5.2
-24.2
19.4
4.7
345+00
4.5
-21.6
6.4
10.8
350+00
3.8
-18.9
6.7
5.9
355+00
1.2
-20.8
4.6
-3.8
360+00
-1.5
-22.6
-22.7
-1.5
365+00
-2.3
-34.1
13.6
-1.1
370+00
-3.1
-45.6
5.7
5.8
Page 1 26

June
2022 to November 2023
Monitoring Station
Pre -Construction
Shoreline Change
Post -Construction
Longshore Average
Threshold Lower Limit
Shoreline Change
Longshore Average
Rates
*Note: Stations where the post -construction shoreline change rate exceeded the lower threshold limit are bolded and shaded.
150
y
C
4A 125
0
0
100
+,
v
C
75
cu
> 50
F
R
25
t
w
Q
°C
W 0
Z
_ -25
U
W
Z -50
LU
0 -75
Ocean Isle
=
Beach Pier
-100
-125
-150
0 0
0 0
0
0
0
0
0 0
0 0
0 0
0 0
0 0
0 0
0
0
0
0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+ +
0 0
+
0
+
0
+ +
0 0
+ +
0 0
+ +
00
+
0
+
+ + + + + + + + + + + + + + + +
0 00 0 0 00 0 0 0 00 0 0 0
N N
N
0 N
N N
0
N N
M W
r,
LO
0 0 0
M 0 a -I M rl r-I r-I
USACE
BASELINE STATIONS (FT)
—Pre-Construction
—Upper Threshold
—Lower Threshold Post -Construction (June 2022-Nov 2023)
Figure 15. Shoreline Change Rates on OIB.
A comparison of the shoreline change threshold rates and the June 2022 to November 2023
shoreline change rates (3-point longshore average) show that 2 of the 53 profiles exceeded the
lower threshold rates. As seen in Figure 15, the two (2) profiles (Station 230+00 and Station
235+00) are located adjacent to each other in the West Beach segment on Ocean Isle Beach.
According to the threshold criteria, which requires a 2-year confirmation period, no action is
needed at this time to address these exceedances of the threshold during this initial assessment.
If either of these stations exceed the threshold following the 2-year confirmation period, however,
coordination with regulatory officials to discuss the potential causation will commence.
Meanwhile, if the shoreline change rate at either of these stations decreases below the threshold
Page 1 27

rate during the confirmation period, the 2-year confirmation period would be reset. It should be
noted that of the 11 stations that exceeded the shoreline change threshold in Year-1, none of
those stations exceeded the shoreline change threshold in Year-2.
150
_a
125
a
O O 100
= t
cc cA
H 75
50
LL
W 25
a
W 0
0
z
_ -25
U
W
? -s0
J
W
Ce
0 -75
-100
-125
-150
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
+ + + + + + + + + + + + + + + + + + + + +
0 0000O m Ln O V� NO �O
rn m oo oo N o Ln Ln m m o D
c m rn m m m m m m m m m m rn rn m m m rn rn m
LISACE BASELINE STATIONS (FT)
—Pre-Construction —Upper Tolerance —Lower Tolerance Post -Construction (June 2022-Nov 2023)
Figure 16. Shoreline Change Rates on Holden Beach.
Shoreline change rates along the oceanfront beach area of Holden Beach are graphically shown in
Figure 16. Pre -construction rates are generally negative (i.e., erosional) for the beach profiles in
proximity to the inlet between Stations 400+00 and 360+00, but were positive (i.e., accretional)
at profiles further from the inlet. Although no monitoring stations exceeded the threshold rates
during the long-term monitoring period (June 2022 to November 2023) (Table 9), the shoreline
between Stations 390+00 and 400+00 experienced erosion. As seen in Figure 16, most of the
monitoring stations did not approach the lower threshold and the long-term rate is similar to the
pre -construction rate. These results suggest that the terminal groin on Ocean Isle Beach has not
affected the modest shoreline changes in Holden Beach since the construction of the structure.
6.2 Inlet Shoreline Threshold Analysis
The inlet shorelines on the eastern end of Ocean Isle Beach (east of Station 0+00) and the western
end of Holden Beach (west of Station 400+00) have exhibited greater variability than the changes
Page 1 28

observed along the oceanfront shorelines. Because of the dynamic shoreline fluctuations caused
by the direct influence of the inlet in these areas, the shoreline change threshold analysis
described in the previous section was not considered as an appropriate means to evaluate changes
to the inlet shorelines. Instead, analysis of aerial imagery of the inlet and adjacent inlet shorelines
taken in June 2022 was employed to document the changes in the position of the inlet shorelines.
Figure 17 shows the May 2023 aerial orthomosaic image that includes the location of the May
2023 shorelines (yellow lines) on either side of the inlet and the established inlet shoreline
thresholds (black lines) on Ocean Isle Beach and Holden Beach. The May 2023 inlet shorelines
were visually interpreted from the wet/dry sand mark on the orthomosaic, which is intended to
represent the general position of the MHW line. The wet/dry sand mark is the line of visual
distinction along the beach between the lighter -colored dry sand on the upper beach face and the
darker colored wet sand below. These shorelines were then digitized to allow for comparative
analysis of the current inlet configuration and the established inlet shoreline thresholds on Ocean
Isle Beach and Holden Beach.
'ttAOL y,
' 1
S .a.
•
4 kA60..
aimm
A.
off'
t
Notes: Legend: j
1. Coordinates are in feet based on the North Carolina State Plane Inlet Threshold Line
Coordinate System, North American Datum of 1983 (NAD 83).
June 6, 2022
2. Background imagery collected on 2023-05-14 by UNCW.
3. The wet/dry line for 2023 based on aerial imagery collected on May 14, 2023 Feet
2023-05-14 by UNCW. 0 500 1,000
Figure 17. Shallotte Inlet Shoreline Change Plot.
Page 1 29

Survey data of the Holden Beach inlet shoreline, as represented by the May 2023 wet/dry
shoreline in Figure 17 indicates that an area, approximately 480 feet in length, exceeded the inlet
shoreline threshold by an average of 30 feet, approximately between Stations 416+00 and 421+00.
The inlet shoreline along Holden Beach delineated in 2022 did not exceed the inlet shoreline
threshold, as show in Figure 17 and Figure 18.
---Monitoring Baseline
3000' North
—HB Inlet Threshold
2500'
—HB June 2022
—HB May 2023 425+00
/ zaoo'
421+00
1500'
\
418+00
m j
Holden
0 416+00 !
a'
Beach
413+00
411+00
Radial 407+00
Number
405+00
403+00
Figure 18. Holden Beach Inlet Shoreline Change (in Feet).
The Ocean Isle Beach wet/dry inlet shoreline depicted in Figure 17 revealed two areas where the
inlet shoreline threshold was exceeded on the western shoulder of Shallotte Inlet. Specifically, on
the interior inlet shoreline adjacent to the Atlantic Intracoastal Waterway (AIWW) and along an
approximate 775-foot section of the inlet shoreline just east of the terminal groin. The interior
inlet shoreline area, 200 ft. in length, exceeded the threshold by an average of approximately 30
ft. The inlet shoreline east of the terminal groin structure exceeded the established threshold line
by a maximum distance of approximately 190 ft. This area also exceeded the threshold during the
previous survey (June 2022) by a maximum distance of approximately 290 ft. While the 2023 inlet
shoreline exceeded the threshold east of the terminal groin, a comparison between the 2022 and
2023 inlet shorelines indicates the inlet shoreline in this area has advanced seaward by an average
distance of approximately 100 ft. and the linear extent of the inlet shoreline exceeding the
threshold decreased by approximately 325 ft. between the June 2022 and May 2023 survey events
Page 1 30

(Figure 19). Based on this, the May 2023 results indicate a positive trend along the inlet shoreline
just east of the terminal groin due to the reduction in the length of shoreline exceeding the
threshold and shoreline distance landward of the inlet shoreline threshold since June 2022.
However, because the shoreline here has exceeded the threshold for 1 year out of the 2-year
confirmation period, this area should be monitored closely. It should be noted that the shoreline
in proximity to the terminal groin has historically demonstrated a trend of erosion since prior to
the construction of the structure. Interestingly, however, this section of shoreline was less eroded
in March 1999, prior to construction of the initial 2001 federal CSRM project.
North — —Monitoring Baseline
400' -35+00 _01B Inlet Threshold (March 1999)
t
-30+00 _016 June 2022
200' _0113 May 2023
-25+00
-200' \ -22+00
/ -400'
\ -20+00
j -600'
I
Ocean Isle I 1 c
1 -800, -15+00 m
Beach I _
� / 3
A /
.(Dr
1
\ / -10+00
-6+04
Radial
— Number
-5+00
0+00
Terminal
Groin
Figure 19. 01B Inlet Shoreline Change (in Feet).
Since construction of the terminal groin and construction of the accretion fillet and CSRM project
were completed in April 2022 (entailing the placement of approximately 757,000 cy of sand along
—8,000 ft. of shoreline to the west of the structure), sand has been observed bypassing the
structure and being deposited in the area immediately east of the terminal groin. The aerial photo
in Figure 20 was taken on July 14t", 2023 and depicts this bypassing and the creation of a sand fillet
on the east side of the structure.
Page 1 31

Figure 20. Sediment Bypassing the Terminal Groin (July 14th, 2023).
It is anticipated that the shoreline width, east of the structure, will continue to increase as the
shoreline equilibrates with the presence of the terminal groin. This shoreline segment may also
continue to benefit from the placement of dredged material by the USACE as a result of navigation
maintenance dredging performed by the USACE within the Shallotte Inlet Crossing. The most
recent project was completed in February 2023 with the placement of approximately 75,000 cy of
sand on the shoreline east of the structure, approximately between Stations -5+00 and -20+00
(Figure 21).
Figure 21. USACE Navigation maintenance material placed on the inlet shoreline, east of terminal groin
(Photo taken 2/22/23).
Page 1 32

Aside from the two (2) areas on the Ocean Isle Beach inlet shoreline as well as the approximate
480 ft. section of inlet shoreline on Holden Beach, where the inlet thresholds have been exceeded,
the majority inlet shoreline changes during this Year-2 monitoring cycle are within the "envelope"
of the inlet shoreline thresholds established by the Shoreline and Inlet Management Plan. This
dynamic area is anticipated to continue to equilibrate to the new hydrodynamic conditions in place
since the construction of the terminal groin, the federal CSRM project, and the dredging of the
Shallotte Inlet borrow area in 2022.
6.3 Hydrographic Survey of Shallotte Inlet
In May 2023, a hydrographic survey of Shallotte Inlet was also conducted to document the post -
construction condition of the borrow area, ebb shoal configuration, and location of the main
channel. Figure 22 shows the bathymetric conditions within Shallotte Inlet based on the May 2023
hydrographic survey which includes the ebb shoal configuration on the east and west sides of the
inlet and the main channel thalweg, or deepwater path through the inlet, as indicated by the solid
black line. The survey shows that the ebb shoals have maintained a similar configuration when
compared to the 2022 hydrographic survey. The 2023 survey also shows shallower depths in the
flood channel that runs along the Ocean Isle Beach inlet shoreline as well as in the nearshore area
just east of the terminal groin structure. Based on these initial monitoring results, this channel
alignment does appear favorable for both the Ocean Isle Beach and Holden Beach inlet shoulders.
Continued monitoring through comparison of subsequent hydrographic surveys is needed to
determine if this trend continues.
Page 1 33

1k ` o
i
r ..
-
.Al,
44
® 1 o 0
1-
rii
111 3'_ 111
E -
1�=�7 7JV
1111
Notes: Legend:
1. Coordinates are in feet based on the North May 2023 Deep Water Channel N
Carolina State Plane Coordinate System, North
American Datum of 1983 (NAD 83). Depths (ft NAVD88) 7-8 14 - 15
2. Background imagery collected on 2023-05-14 4 and Shallower
by UNCW. 8 - 10 15 and Deeper
3. Shallotte Iniet bathymetric data collected in 4-6 to- 12
May 2023. The vertical datum are in feet Feet
based on the North American Vertical Datum 6-7 12 - 14 0 500 1,000
of 1988 (ft NAVD88).
Figure 22. May 2023 Shallotte Inlet Hydrographic Survey Elevation Map.
Page 1 34

6.4 Annual Visual Inspection
On November 20th, 2023, CPE performed an inspection of the terminal groin structure to visually
assess the condition of the rubblemound and anchorage sections and to qualitatively assess the
condition of the accretion fillet and the adjacent shoreline east of the structure. Along with the
visual inspection, aerial imagery was collected via drone to compare with imagery collected in May
2023. At the time of the visual inspection, the entire anchorage section consisting of a concrete
capped sheet pile wall was completely buried. In addition, approximately 100 ft of the landward
portion of the rubblemound structure was covered with sand. This differs from the conditions
observed immediately following the construction of the structure when the landward portion of
the rubblemound structure was exposed. This indicates that that the elevation of the beach in
this area has increased since the project was completed in April 2022. Visual observations of the
rubblemound structure showed no signs of significant armor stone movement or change in the
crest elevation of the structure. Figure 23 depicts the location of the rubblemound portion of the
terminal groin in November 2023 relative to the construction footprint, indicating the terminal
groin has remained within the permitted construction footprint.
Figure 23. Terminal groin with footprint overlayed (imagery collected November 20, 2023)
Figure 24 shows the conditions of the top of the groin on November 20, 2023. Additionally, a
comparison between the May and November 2023 aerial imagery indicated that the accretion
fillet shoreline adjacent to the terminal groin has receded approximately 90 ft. between the two
dates.
Page 1 35

Figure 24. View of the top of the groin looking south (Photo taken November 20, 2023)
7 CONCLUSIONS
This second annual monitoring report event of the documenting following construction of the
Ocean Isle Beach Shoreline Protection Project (terminal groin and accretion fillet) serves to
document the linear shoreline and volumetric changes along the entirety of Ocean Isle Beach's
oceanfront shoreline and the western 10,000 feet of Holden Beach's oceanfront shoreline. In
addition, it included an assessment of the hydrographic changes within Shallotte Inlet and the inlet
shorelines on the east and west shoulders of the inlet. Results of the 2023 annual monitoring have
been discussed in terms of long-term changes that occurred relative to the June 2022 baseline
survey as well as the recent short-term changes between May 2023 and November 2023.
Overall, the 2023 monitoring results of the Ocean Isle Beach volumetric change analyses show that
the East Beach segment experienced the most erosion followed by the West Beach segment that
also experienced a trend of erosion during the recent 6-month monitoring period. The Central
Beach and West End segments experienced net accretion. The linear shoreline analysis indicated
that the MHW position advanced seaward on average in all the segments during the recent period.
The data from the long-term period (June 2022 to November 2023) indicated the same trends as
those revealed from the analysis of the short-term time frame data sets. Volumetric change
analyses indicated that the East Beach segment experienced the most erosion followed by the
West Beach segment which also eroded over the long-term period. The West End and Central
Beach segments, however, accreted material during this time frame. The linear shoreline analysis
indicated that only the East Beach segment retreated at the MHW position during the long-term
period while the other three beach segments migrated seaward.
Page 1 36

The shoreline threshold monitoring results along the Ocean Isle Beach oceanfront shoreline
indicate that the long-term post -construction shoreline change rates for two out of 53 of the
stations exceeded the established shoreline change rate threshold, neither of which exceeded the
threshold based on the Year-1 monitoring results. The two stations are located within the West
Beach segment on Ocean Isle Beach. The May 2023 wet/dry inlet shoreline, digitized from the
May 2023 aerial image also revealed two locations along the OIB inlet shoreline where the
established inlet shoreline threshold was exceeded. The two areas where the inlet shoreline
threshold was exceeded are generally located in the same areas that were identified in the Year-
1 report but with a reduced alongshore and cross -shore extent. The areas are located along the
interior inlet shoreline of Ocean Isle Beach, adjacent to the Atlantic Intracoastal Waterway
(AIWW), and along an approximately 775 ft. section of the inlet shoreline immediately east of the
terminal groin structure. Historically, the inlet shoreline east of the structure where the threshold
was exceeded has been severely eroded since before the construction of the terminal groin,
however, this section of shoreline was less eroded in March 1999, prior to construction of the
initial 2001 federal CSRM project. However, approximately 75,000 cy of navigation maintenance
material dredged from the Shallotte Inlet Crossing by the USACE was also placed just east of the
terminal groin (roughly between Stations -5+00 and-20+00) in February 2023. Continued
placement of the navigation maintenance material on the shoreline east of the terminal groin is
expected to moderate future erosion in the area.
Since the completion of the Ocean Isle Beach 2022 Shoreline Protection Project and the federal
CSRM project, sand has continued bypassing the structure and being deposited in the area
immediately east of the terminal groin. Continued equilibration as well as the shoreline stabilizing
from the effects of the of the beach fill projects, continued sand bypassing the structure, and
periodic infusions of fill from USACE the navigation maintenance dredging of the Shallotte Inlet
Crossing are expected to moderate future erosion on the shoreline east of the terminal groin. The
two (2) monitoring stations on Ocean Isle Beach where the post -construction shoreline change
rates exceeded the threshold rates as well as the two (2) sections along Ocean Isle Beach's inlet
shoreline that exceeded the thresholds will continue to be monitored.
On Holden Beach, the recent volume change rates (May 2023 to November 2023) along the
oceanfront shoreline indicated erosion at 14 of the 21 monitoring stations. However, the MHW
shoreline change rates indicated a shoreline advance at 16 of the 21 monitoring stations. The
long-term post -construction linear shoreline and volume changes along the Holden Beach
oceanfront shoreline indicated seaward advance and accretion, respectively. The shoreline
threshold analysis results along the Holden Beach oceanfront shoreline show that none of the
post -construction shoreline change rates measured at each monitoring station exceeded the
established shoreline change threshold. The analysis of aerial imagery showed the May 2023
wet/dry line representing Holden Beach's inlet shoreline showed an approximate 480 ft. section
exceeded the inlet shoreline threshold by an average of 30 feet. The inlet shoreline threshold on
Holden Beach was not exceeded in Year-1.
The areas on Ocean Isle Beach and Holden Beach where the post -construction oceanfront and
inlet shoreline changes exceeded the thresholds will be monitored over the 2-year confirmation
Page 1 37

period. The Plan includes the establishment of a 2-year confirmation period to account for
possible short-term shoreline changes that could be caused by storm events or other factors. If
during the confirmation period the oceanfront and inlet shoreline changes where the thresholds
have been breached no longer exceed the thresholds, the 2-year confirmation period will be reset.
If the shoreline changes continue to exceed the thresholds over the entire 2-year confirmation
period, an assessment of the proper responsive measures will be made through coordination with
State and Federal regulatory officials.
In the event the area is impacted by a catastrophic storm such as a hurricane or severe nor'easter
that causes major changes in the shoreline, subsequent shoreline changes would likely exceed the
thresholds for some time. If after the 2-year post -storm confirmation period, shoreline changes
are still being impacted by the storm induced changes and some of the measured shoreline
changes still exceed the thresholds, an assessment will be made to determine if a new reference
shoreline condition is needed to adequately evaluate potential project induced shoreline impacts
that occur following the storm. Continued monitoring of these oceanfront and inlet monitoring
stations will help to establish more representative long-term post -construction shoreline change
rates within the study area.
Page 1 38

8 REFERENCES
CPE, 2023. Coastal Protection Engineering of North Carolina, Inc., Town of Ocean Isle Beach
2022 Shoreline & Inlet Monitoring Report, Wilmington, NC.
CPE-NC, (2016) Final Environmental Impact Statement Terminal Groin and Beach Fillet; Town of
Ocean Isle Beach, Brunswick County, North Carolina.
USACE, (2002) Ocean Isle Beach Nourishment Project: Inlet and Shoreline Monitoring Report No.
1; Town of Ocean Isle Beach, Brunswick County, North Carolina.
Page 1 39

APPENDIX A: Comparative Beach Profile Plots for Ocean Isle Beach Monitoring Stations
Page 1 40

Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:N35+00
20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
DISTANCES REFERENCED TO: N = 56787 FEET, E = 2186771 FEET, AZIMUTH = 88 DEGREE
-30
— June 2022
— May 2023
-800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

011
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION : N30+00
DISTANCES REFERENCED TO: N = 56309 FEET, E = 2186849 FEET, AZIMUTH = 104 DEGREE
— June 2022
— May 2023
-30800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:N25+00
DISTANCES REFERENCED TO: N = 55824 FEET, E = 2186727 FEET, AZIMUTH = 104 DEGREE
— June 2022
— May 2023
-ju
-800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

081
will
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION: N22+00
DISTANCES REFERENCED TO: N = 55574 FEET, E = 2186665 FEET, AZIMUTH = 119 DEGREE
— June 2022
— May 2023
-ju
-800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

20
10
00
00
> 0
z
w
w
Ll-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION: N20+00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 55405 FEET, E = 2186490 FEET, AZIMUTH = 135 DEGREE
-ju
-800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION : N 15+00
DISTANCES REFERENCED TO: N = 55057 FEET, E = 2186131 FEET, AZIMUTH = 135 DEGREE
— June 2022
— May 2023
-ju
-800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION : N 10+00
DISTANCES REFERENCED TO: N = 54709 FEET, E = 2185773 FEET, AZIMUTH = 135 DEGREE
— June 2022
— May 2023
-30800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

0�
10
00
00
> 0
z
F-
w
w
Ll-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:N6+00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 54455 FEET, E = 2185514 FEET, AZIMUTH = 150 DEGREE
-ju
-800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

081
will
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:N5+00
DISTANCES REFERENCED TO: N = 54438 FEET, E = 2185376 FEET, AZIMUTH = 172 DEGREE
— June 2022
— May 2023
-ju
-800 -400 0 400 800 1200 1600 2000 2400 2800
DISTANCE ALONG PROFILE (FEET)

081
will
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:0+00
DISTANCES REFERENCED TO: N = 54373 FEET, E = 2184881 FEET, AZIMUTH = 172 DEGREE
— June 2022
— May 2023
— November 2023
-3 350 0 350 700 1050 1400 1750 2100 2450 2800
DISTANCE ALONG PROFILE (FEET)

001
will
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:5+00
DISTANCES REFERENCED TO: N = 54307 FEET, E = 2184386 FEET, AZIMUTH = 172 DEGREE
— June 2022
— May 2023
— November 2023
-3 350 0 350 700 1050 1400 1750 2100 2450 2800
DISTANCE ALONG PROFILE (FEET)

0XII
Wil
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:10+00
DISTANCES REFERENCED TO: N = 54241 FEET, E = 2183890 FEET, AZIMUTH = 172 DEGREE
— June 2022
— May 2023
— November 2023
-3 350 0 350 700 1050 1400 1750 2100 2450 2800
DISTANCE ALONG PROFILE (FEET)

011
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:15+00
DISTANCES REFERENCED TO: N = 54175 FEET, E = 2183394 FEET, AZIMUTH = 172 DEGREE
— June 2022
— May 2023
— November 2023
-3 350 0 350 700 1050 1400 1750 2100 2450 2800
DISTANCE ALONG PROFILE (FEET)

001
will
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:20+00
DISTANCES REFERENCED TO: N = 54109 FEET, E = 2182899 FEET, AZIMUTH = 172 DEGREE
— June 2022
— May 2023
— November 2023
-3 350 0 350 700 1050 1400 1750 2100 2450 2800
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:25+00
DISTANCES REFERENCED TO: N = 54043 FEET, E = 2182403 FEET, AZIMUTH = 172 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:30+00
DISTANCES REFERENCED TO: N = 53977 FEET, E = 2181908 FEET, AZIMUTH = 172 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:35+00
DISTANCES REFERENCED TO: N = 53768 FEET, E = 2181455 FEET, AZIMUTH = 172 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:40+00
DISTANCES REFERENCED TO: N = 53554 FEET, E = 2181003 FEET, AZIMUTH = 171 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

081
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:45+00
DISTANCES REFERENCED TO: N = 53450 FEET, E = 2180514 FEET, AZIMUTH = 168 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:50+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 53345 FEET, E = 2180025 FEET, AZIMUTH = 168 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
will
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:55+00
DISTANCES REFERENCED TO: N = 53212 FEET, E = 2179543 FEET, AZIMUTH = 164 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:60+00
DISTANCES REFERENCED TO: N = 53075 FEET, E = 2179062 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:65+00
DISTANCES REFERENCED TO: N = 52926 FEET, E = 2178585 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:70+00
DISTANCES REFERENCED TO: N = 52777 FEET, E = 2178107 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:75+00
DISTANCES REFERENCED TO: N = 52629 FEET, E = 2177630 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:80+00
DISTANCES REFERENCED TO: N = 52480 FEET, E = 2177153 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:85+00
DISTANCES REFERENCED TO: N 52331 FEET, E = 2176675 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:90+00
DISTANCES REFERENCED TO: N = 52182 FEET, E = 2176198 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:95+00
DISTANCES REFERENCED TO: N = 52033 FEET, E = 2175721 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

0�
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:100+00
DISTANCES REFERENCED TO: N = 51884 FEET, E = 2175243 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
101
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:105+00
DISTANCES REFERENCED TO: N = 51735 FEET, E = 2174766 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:110+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 51587 FEET, E = 2174289 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
Wil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:115+00
DISTANCES REFERENCED TO: N = 51438 FEET, E = 2173811 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:120+00
DISTANCES REFERENCED TO: N = 51289 FEET, E = 2173334 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
Wil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:125+00
DISTANCES REFERENCED TO: N = 51140 FEET, E = 2172857 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:130+00
DISTANCES REFERENCED TO: N = 50991 FEET, E = 2172379 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
Wil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:135+00
DISTANCES REFERENCED TO: N = 50842 FEET, E = 2171902 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:140+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 50693 FEET, E = 2171425 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

0XII
101
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:145+00
DISTANCES REFERENCED TO: N = 50545 FEET, E = 2170947 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:150+00
DISTANCES REFERENCED TO: N = 50397 FEET, E = 2170470 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:155+00
DISTANCES REFERENCED TO: N = 50248 FEET, E = 2169992 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:160+00
DISTANCES REFERENCED TO: N = 50100 FEET, E = 2169515 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:165+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 49951 FEET, E = 2169038 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:170+00
DISTANCES REFERENCED TO: N = 49802 FEET, E = 2168560 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
Wil
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:175+00
DISTANCES REFERENCED TO: N = 49653 FEET, E = 2168083 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
00
00
> 0
z
w
w
Ll-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:180+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 49505 FEET, E = 2167606 FEET, AZIMUTH = 162 DEGREE
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:185+00
DISTANCES REFERENCED TO: N = 49356 FEET, E = 2167128 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:190+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 49207 FEET, E = 2166651 FEET, AZIMUTH = 162 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:195+00
DISTANCES REFERENCED TO: N = 49057 FEET, E = 2166174 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:200+00
DISTANCES REFERENCED TO: N = 48908 FEET, E = 2165697 FEET, AZIMUTH = 162 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:205+00
DISTANCES REFERENCED TO: N = 48742 FEET, E = 2165225 FEET, AZIMUTH = 160 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:210+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 48575 FEET, E = 2164754 FEET, AZIMUTH = 160 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:215+00
DISTANCES REFERENCED TO: N = 48514 FEET, E = 2164259 FEET, AZIMUTH = 160 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

081
will
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:220+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 48464 FEET, E = 2163761 FEET, AZIMUTH = 160 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:225+00
DISTANCES REFERENCED TO: N = 48314 FEET, E = 2163287 FEET, AZIMUTH = 160 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:230+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 48144 FEET, E = 2162816 FEET, AZIMUTH = 160 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:235+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 47974 FEET, E = 2162346 FEET, AZIMUTH = 160 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

011
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION : 240+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 47773 FEET, E = 2161888 FEET, AZIMUTH = 156 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:245+00
DISTANCES REFERENCED TO: N = 47573 FEET, E = 2161430 FEET, AZIMUTH = 156 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:250+00
DISTANCES REFERENCED TO: N = 47374 FEET, E = 2160971 FEET, AZIMUTH = 156 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

001
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:255+00
DISTANCES REFERENCED TO: N = 47129 FEET, E = 2160536 FEET, AZIMUTH = 156 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:260+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 46874 FEET, E = 2160106 FEET, AZIMUTH = 160 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:265+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 46695 FEET, E = 2159641 FEET, AZIMUTH = 160 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

rzil
Wil
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:270+00
DISTANCES REFERENCED TO: N = 46529 FEET, E = 2159169 FEET, AZIMUTH = 160 DEGREE
— June 2022
— May 2023
— November 2023
-300 300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

20
10
co
co
> 0
z
w
w
LL-
O
F-
-10
w
J
W
-20
-30L
Ocean Isle Beach, NC - 2023 Beach Monitoring
STATION:275+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 46333 FEET, E = 2158709 FEET, AZIMUTH = 156 DEGREE
300 600 900 1200 1500 1800 2100 2400 2700
DISTANCE ALONG PROFILE (FEET)

APPENDIX B: Comparative Beach Profile Plots for Holden Beach Monitoring Stations

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
.o
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:300+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 58000 FEET, E = 2200814 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

till
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:305+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 57934 FEET, E = 2200319 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:310+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 57868 FEET, E = 2199824 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
°o 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-40
-500
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:315+00
DISTANCES REFERENCED TO: N = 57802 FEET, E = 2199328 FEET, AZIMUTH = 172 DEGREE
500 1000
1500 2000 2500
DISTANCE ALONG PROFILE (FEET)
— June 2022
— May 2023
— November 2023
3000 3500
l

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:320+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 57723 FEET, E = 2198738 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:325+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 57671 FEET, E = 2198337 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:330+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 57608 FEET, E = 2197840 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:335+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 57544 FEET, E = 2197345 FEET, AZIMUTH = 172 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:340+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 57462 FEET, E = 2196703 FEET, AZIMUTH = 171 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:345+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 57410 FEET, E = 2196354 FEET, AZIMUTH = 171 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-40
-500
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:350+00
DISTANCES REFERENCED TO: N = 57336 FEET, E = 2195858 FEET, AZIMUTH = 171 DEGREE
500 1000
1500 2000 2500
DISTANCE ALONG PROFILE (FEET)
— June 2022
— May 2023
— November 2023
3000 3500

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:355+00
DISTANCES REFERENCED TO: N = 57262 FEET, E = 2195365 FEET, AZIMUTH = 171 DEGREE
— June 2022
— May 2023
— November 2023
-500 500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:360+00
DISTANCES REFERENCED TO: N = 57206 FEET, E = 2194869 FEET, AZIMUTH = 168 DEGREE
— June 2022
— May 2023
— November 2023
-500 500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:365+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 57088 FEET, E = 2194380 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:370+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 56987 FEET, E = 2193891 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:375+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 56886 FEET, E = 2193401 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:380+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 56785 FEET, E = 2192910 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
00
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
'I
-500
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:385+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 56685 FEET, E = 2192422 FEET, AZIMUTH = 168 DEGREE
500 1000
1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:390+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 56584 FEET, E = 2191931 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:395+00
DISTANCES REFERENCED TO: N = 56483 FEET, E = 2191442 FEET, AZIMUTH = 168 DEGREE
— June 2022
— May 2023
— November 2023
-500 500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION A00+00
— June 2022
— May 2023
— November 2023
DISTANCES REFERENCED TO: N = 56372 FEET, E = 2190904 FEET, AZIMUTH = 168 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION A03+00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 56386 FEET, E = 2190674 FEET, AZIMUTH = 183 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION A05+00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 56428 FEET, E = 2190547 FEET, AZIMUTH = 198 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION A07+00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 56499 FEET, E = 2190439 FEET, AZIMUTH = 213 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION : 411 + 00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 56592 FEET, E = 2190356 FEET, AZIMUTH = 228 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:413+00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 56700 FEET, E = 2190302 FEET, AZIMUTH = 243 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
.o
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION A16+00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 56815 FEET, E = 2190279 FEET, AZIMUTH = 258 DEGREE
-500 500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:418+00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 56927 FEET, E = 2190285 FEET, AZIMUTH = 273 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION :421+00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 57030 FEET, E = 2190319 FEET, AZIMUTH = 288 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)

30
20
10
tt
0 0
0
z
F-
w
LE -10
z
O
Q
w -20
J
W
-30
-50L
Holden Beach, NC - 2023 Beach Monitoring Offshore
STATION:425+00
— June 2022
— May 2023
DISTANCES REFERENCED TO: N = 57118 FEET, E = 2190377 FEET, AZIMUTH = 303 DEGREE
500 1000 1500 2000 2500 3000 3500 4000
DISTANCE ALONG PROFILE (FEET)