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Lake Grove (Twin Lakes) Dams Rehabilitation

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Project Update

Spring 2026 Update: The dams reconstruction is almost complete and greenway construction has started. Focus will now be on cleaning up and stabilizing the site. Once construction is complete and NC Dam Safety issues an approval to impound each of the two lakes, the contractor will close the valves and they will fill naturally. We appreciate your continued patience as we work to enhance the safety and resilience of these dams.

Winter 2025-2026 Update: Construction on the two dams began in June 2025 and remains on schedule. The contractor successfully completed construction of the two new outlet structures - one for each of the Twin Lakes dams. Reconstruction of both dams are underway. Greenway construction is now starting. 

Spring 2025 Update: The project was awarded with a start date of June 1, 2025.

Learn more about this project: Watch the Virtual Meeting

 

Background

Cary has owned the lakes near Lake Grove Boulevard since 2014. There will be two dams that will be rebuilt and two new outlet control structure. In the 2022 budget, funding was approved to start the design and permitting process. In 2023, funding was approved for construction in the budget.

Project Scope

Cary is committed to strengthening the reliability and safety of its Stormwater infrastructure. As part of this effort, Cary will rebuild the dams and outlet control structure Lake Grove (Twin Lakes) dams which are classified as high-hazard. The dams will be rebuilt to a higher elevation with gentler slopes to meet North Carolina Department of Environmental Quality requirements and enhance public safety.

The lakes will be lowered to allow for outlet control structure installation and dredging, with construction access from Lake Grove Boulevard and a staging area within the property. Construction begins June 1, 2025 (tentative), and will last approximately 21 months.

twin lakes

Frequently Asked Questions

What can those of us who live around the lakes expect during construction?
What should I do during construction?
Will the greenway trail on the southwest side of the lake remain open?
What impact will this construction have on accessibility around the lakes?
Why is Cary doing this project?
What is the scope of this project?
What are the work hours and how long will construction take?
Will the lakes have to be drained?
How will wildlife be handled during the project?
Who can we expect to see on the site?
Will sediment be removed from the lake? How and where will it go?
How many trees will be cut around the lakes?
What is the plan for the future greenway?
Will the project include any park amenities?
Why clear open lawn areas if a future park is planned?
Will nearby ponds be impacted by the project?
Can the dry lower pond be turned into a wetland?
How long have the lakes been at this location?
If we have further questions who do we contact?

Contact

Phone: Dial 311 within town limits or (919) 469-4000 outside of Cary

Email: 311@carync.gov

Billy Lee, PE, CFM, LEED AP
Assistant Director of Stormwater and Floodplain Management