Projects & Case Studies

Environmental Planning & Permitting, Water Resources

US Army Corps of Engineers, Fish Passage at Lock & Dam 1

Wilmington, NC

Services Utilized

Construction Management
Environmental Planning and Permitting
Water Resources

Project Summary

US Army Corps of Engineers, Fish Passage at Lock & Dam 1

Wilmington, NC

The SEPI Team was contracted by the US Army Corps of Engineers (USACE), Wilmington District, to design a fish passage at Lock and Dam No. 1 (L&D #1) on the Cape Fear River near Wilmington, NC. This project was the first fish passage constructed on the east coast, and it utilized lessons learned from the USACE, St. Paul District on over 40 fish passage projects already in use. The project provided mitigation for potential impacts on the endangered shortnose sturgeon and other fish species due to rock removal and blasting for proposed Wilmington Harbor Deepening, and allowed for spawning areas to be reached without affecting water users. The Fish Passage structure consisted of a series of rock arched ramps with weir and pool configurations to allow for a design slope for fish passage. In addition to the Fish Passage structure, a steel sheet pile retaining wall was designed and located parallel with the existing lock structure to prevent proposed Fish Passage rock loads from de-stabilizing the lock structure. Because of ARRA funding, this was a time-sensitive project that involved daily coordination, weekly meetings, and a diverse Team. All project milestones were met either on schedule or ahead of schedule.

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