Brockton Drive Dam Rehabilitation

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

The road will be closed between Bayliner Drive and Gentilly Place until the project is complete. Weather delays have extended the construction schedule - work will now be completed in the spring.

Project Details

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

Construction to the lower dam is underway. We've closed Brockton Drive until construction is complete. Work is now expected to be completed in early May because of weather delays.

Completed Work

Relocated the sewer line in the project area;
Installed the re-designed cofferdam. The temporary sheet pile cofferdam held off lake water during construction. The re-design added some more time to the construction schedule, but we needed to make adjustments because of field conditions;
Added a bypass pipe for the cofferdam;
Excavated the area for the new dam and concrete structure; and,
Removed the temporary cofferdam that was put in place early in the construction phase.

Final Work

The contractor finished building the main parts of the dam. Crews are now working on the overtopping protection of the dam. We are using reinforced concrete instead of roller-compacted concrete as originally planned. They are also installing riprap (rock) to protect the slope of the dam. See a live view of the work.

Note: If you live near the construction fence - place garbage cans on the left side of the entrance for pickup during construction.

Detour

The road will be closed to all traffic between Bayliner Drive and Gentilly Place. Detour signs are rerouting traffic around the construction area through Whitehall Avenue, Hoyle Drive, and E. Millbrook Road.

Hours

Crews will work Monday - Friday from 7:30 a.m. - 5:30 p.m.
There is no work scheduled on the weekend (unless approved by the City of Raleigh).

The Lake

We've drained the lake since the dam is not functioning right. This will limit the amount of water in the lake and reduce impacts during heavy rainstorms. Crews also have:

Added silt fences to prevent sediment from leaving the construction site; and,
Cleared trees in the construction area.

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
Spring 2021	Phase 2 construction complete (Date extended due to rain)

Crews building a new dam structure at a lake on Brockton Drive. They also built a cofferdam to divide the worksite and the upper lake. The cofferdam will be in place during construction.

Concrete slabs that were put in place to building the spillway for the dam on Brockton Drive.

History

The spillway for the upper lake at Brockton Drive was in very poor condition. The upper lake also 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.

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.