COUNTY ROAD 405 LOW WATER CROSSING BRO-NBIL-B099(22)

Project Overview

The existing Low Water Crossing (LWC) on County Road 405 is a concrete structure with steel culverts designed to pass low flow events. The crossing replaced an existing bridge in the 1980s, providing a cost-effective solution at the time. Scotland County determined the crossing is not functioning as intended due to the frequency of overtopping and elected to utilize their BRO funds to replace the structure with a bridge. McClure provided survey, hydraulic analysis, permits, geotechnical design, preliminary layout, and final bridge design. McClure will provide materials testing, and construction observation services during construction. The project is scheduled for construction in late 2020. The final design includes a single span structure with steel H-piles for the substructure and precast prestressed concrete NU70 girders for the superstructure with a concrete deck. The 145’-1” single-span structure will allow for increased hydraulic capacity and reduced potential for scour. The proposed structure also has increased width for two-way traffic and large agricultural equipment. With many large farmers and a seed business in the area, the new structure is welcomed.

Project Highlights:

• Increased safety by eliminating the low water crossing.
• Improved access by installing the bridge crossing vs. the existing low water crossing.
• The large single span structure reduces the potential for scour and debris build up.