20191084 Ver 1_Culvert Info_20190819

Carpenter, Kristi
From: Murray, Christopher A
Sent: Monday, August 19, 2019 11:21 AM
To: Ridings, Rob
Cc: Montague, Heather W
Subject: Warren Bridge 135 over Fishing Creek (17BP.5.R.88)
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I am following up with some information regarding the structure recommendation for Warren Bridge 135 over Fishing
Creek (17BP.5.R.88):
-Early on, the PEF design firm and geotechnical unit indicated concern with a typical bridge replacement structure at this
location. There were concerns with typical end bend construction/maintenance/stability of a proposed replacement
bridge structure with the frequency of pressure flows and velocities.
-Discussion with the geotechnical unit indicated that a bridge abutment would have to be a massive vertical concrete
abutment due to the pressure flows and velocities. The incised drainage in this valley would put significant pressure on
the abutment.
-Additional discussions with the hydraulic unit indicated concern about lift of a bridge during flooding events.
-All the concerns at the site led the Department proposing to use a concrete bottomless arch structure that will be
anchored into the bedrock as the replacement structure. The following screen shots depict the proposed structure:
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-You may be aware that the federally protected Atlantic pigtoe is present at the site. This presented a significant hurdle
to overcome, involving long discussions and an on site meeting with Gary Jordan and Travis Wilson to present our
concerns that a standard bridge replacement structure would not work at the site. Please call if you need additional
information.
Chris
Christopher A. Murray, PWS
Project Engineer for Planning and Environmental Studies
Project Delivery Unit
Division 5
[phone] office
camurrayancdot.gov
NCDOT-Division 5
2612 N. Duke Street
Courier: 17-27-03
Durham, NC 27704
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