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Anacostia River Tunnel Project

The Anacostia River Tunnels project is designed to capture and provide storage for combined sewer overflows (CSOs) being discharged to the Anacostia River. The project consists of a system of deep large diameter underground storage tunnels and associated diversion and pumping facilities. The tunnel system is for the conveyance and storage of combined sewage overflow and consists of a series of three tunnels from Blue Plains Advanced Wastewater Treatment Plant to the north east boundary area in the vicinity of Brentwood Reservoir. In addition, a system of smaller diameter branch tunnels will extend from the Brentwood site to locations along Rhode Island Avenue, for flood control.

When completed, this project together with CSO control projects already completed or underway are expected to reduce CSOs to the Anacostia River by about 98 percent.

The Anacostia River Tunnels are the first piece of the Clean Rivers Project to begin construction. Please continue to visit this page to learn about project updates.

Download a more detailed Project Information Sheet or Environmental Assessment on the Anacostia River Tunnel Project.

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