20171544 Ver 1_SW Plan_20171201

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S1o►111WStP1' Highway Stormwater Program
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STORMWATER MANAGEMENT PLAN _.
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 17BP.2.R.84 TIP No.: SF-530049 County(ies): Lenoir Page 1 of 1
General Project Information
WBS Element: 17BP.2.R.84 TIP Number: SF-530049 Project T pe: Brid e Replacement Date: 8/14/2017
NCDOT Contact: Paul (Andy) Jordan, P.E. Contractor / Designer: Kimley-Horn & Associates
Address: NCDOT Hydraulics Design Unit Address: 421 Fayetteville Street
1020 Birch Ridge Drive Suite 600
Raleigh, NC 27610 Raleigh, NC 27601
Phone: [phone] Phone: [phone]
Email: paiordan(c�ncdot.qov Email: dan.robinson(a�kimlev-horn.com
CitylTown: Seven Springs County(ies): Lenoir
River Basin(s): Neuse CAMA County? No
Wetlands within Project Limits? No
Project Description
Pro'ect Len th lin. miles or feet : 121 miles Surrounding Land Use: Rural
Proposed Pro'ect Existing Site
Project Built-Upon Area (ac. 0.5 ac. 0.3 ac.
Typical Cross Section Description: 2@ 11' wide lanes with 4' 5" paved shoulders and 42" vertical barrier rails 1@ 33' wide bridge
Annual Avg Daily Traffic (vehlhr/day): Desi n/Future: NA Year: 2040 Existin : 230 vpd Year: 2013
General Project Narrative: The bridge replacement on SR 1311 (Bear Creek Road) conveys Bear Creek from North to South and ultimately drains into the Neuse River. The existing bridge , overall length
(Description of Minimization of Water (OAL) = 102' and width 21' will be replaced with a bridge having an OAL = 148' and width = 33'. The new bridge is wider than the existing bridge to provide the required
Quality Impacts) shoulders and lane width necessary for roadway and drainage. The proposed bridge and roadway improvements minimized the existing overtopping condition and maintain a
minimal transition between existing and new roadway.
Runoff from the bridge is captured on the low side of the bridge in shoulder berm gutter and tra�c bearing 2GI's on either side of the road. The 15" pipe system is designed to
outfall (with rip rap outlet protection) outside of buffer zones 1 and 2. The existing flat vegetated floodplain will treat the minimal increase in impervious area from bridge
widening.
Bear Creek is a FEMA stream that is shown on Flood Insurance Rate Map (FIRM) panel 370144-3564-J, dated 07/02/2004. A hydraulic analysis on Bear Creek was performed
to assess the potential flood level increases associated with this project. Based on this analysis, the proposed bridge replacement project was not shown to cause an increase
in the base flood year level along the study reach of Bear Creek.
Waterbody Information
Surface Water Body (1): Bear Creek NCDWR Stream Index No.: 27-72-(0.1)
NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply IV (WS-IV)
Supplemental Classification: Swamp Waters (Sw) (NSW)
Other Stream Classification:
Impairments: None
Aquatic T&E Species? No Comments:
NRTR Stream ID: Buffer Rules in Effect: Neuse
Project Includes Bridge Spanning Water Body? Yes Deck Drains Discharge Over Buffer? No Dissipator Pads Provided in Buffer? No
Deck Drains Discharge Over Water Body? No (If yes, provide justification in the General Project Narrative) (If yes, describe in the General Project Narrative; if no, justify in the
(If yes, provide justifcation in the General Project Narrative) General Project Narrative)