Brockton Drive Dam Rehabilitation

We are replacing the structure at the lower dam on Brockton Drive Lake with a roller-compacted concrete structure. The project addresses dam safety concerns, reduces the frequency and severity of flooding, and improves water quality.

Project Details

Type:: Stormwater
Budget:: $4.2 million
Project Lead:: Stormwater Management
Contractors:: CDM Smith, Inc. (Design), Thalle Construction (Construction)

Phase 2 (Lower dam)

The design for phase two is complete. The spillway structure and the dam at the lower lake will be replaced with a roller-compacted concrete structure. Construction is now expected to start in winter 2020 - There have been a few delays getting the required permits for the project.

Since this dam is not functioning properly, the lake will be drained through the start of construction. This will limit the amount of water in the lake to reduce impacts from heavy rain storms.

History

The existing spillway for the upper lake at Brockton Drive was in very poor condition. The upper lake collected debris and flooded nearby homes during heavy rainstorms. The lower lake dam spillway is too small and there is severe erosion at the outlet of the pipe.

Brockton Drive Stormwater Infrastructure

New storm drain at Upper Brockton Drive Lake (during construction)

Upper Brockton Drive Lake (prior to construction)

Schedule

Date	Activity
Fall 2018	Phase 1 construction complete
Spring 2019	Phase 2 design complete
Summer 2019	Phase 2 construction bid and permitting process
Winter 2020	Phase 2 construction begins

Phase One

The project included replacing stormwater drainage and sanitary sewers, and transforming the upper lake to a stream channel. The stream channel flows through the newly constructed stormwater infrastructure into the lower lake. These changes will improve the channel's water quality and reduce flooding to nearby homes.