Hart Brook Sewer Stabilization Project

Lewiston, Maine

photo of a pipe going under a support bridge along a stream in the woods

Project Scope

In 2016, Haley Ward began assisting the City of Lewiston with evaluating solutions to repair an eroded section of Hart Brook.  Over many years experiencing heavy flow velocities around a bend in the brook, the bank had eroded enough to fully expose a buried sanitary sewer main.  Due to its classification as an Urban Impaired Stream, and Critical Salmon Habitat, the Brook is of high importance to the City, Maine Department of Environmental Protection (MDEP), Department of Inland Fisheries and Wildlife, and the Army Corps of Engineers.  As such we worked closely with all stakeholders to incorporate the necessary design considerations to satisfy permitting requirements.  While our design focused on reconstructing the bank around the sewer main and armoring the face to prevent future erosion, we also developed a construction sequence that allowed the work to be completed in accordance with the permits.  This sequence included a bypass and dewatering technique to safely dewater the work area without harming potential fish in the pool.

Throughout the construction process, Haley Ward provided technical observation for the client to ensure the project was constructed as designed as well as assistance to the Contractor during the dewatering phase.



Project Data

Evaluated Solutions to Repair Eroded Section of Hart Brook Developed Design and Construction Sequence
Providing Technical Observations Throughout Construction Process Assisted Contractor During Dewatering