The Commonwealth, Ashby, and Glebe Flood Mitigation Project — one of the largest flood mitigation projects in the city other than the huge RiverRenew project — is set to hit a planning milestone sometime this spring.
In a February Flood Action newsletter, city staff said the project is set to hit the “60% of the project design” milestone sometime this spring.
According to the newsletter:
Designs provided at the 60 percent benchmark will include additional project details, such as utility relocation design, structural details for culvert and storm sewer system, easements or right-of-way acquisitions to support project construction, and a more detailed review of constructability and construction methodology.
The project is an amalgamation of two large-capacity projects providing flood relief for the northern end of Del Ray and Lynhaven.
“The proposed design includes new parallel relief sewers along Commonwealth Avenue and East Glebe Road, which will increase the capacity of the storm sewer system,” the city’s website said. “Additionally, a new outfall will be installed to discharge flows to Four Mile Run. Finally, green infrastructure practices will be implemented to provide a water quality benefit to the watershed.”
The project is estimated to cost $50 million.
Construction is expected to start in Summer 2026 and be completed by Summer 2029.
