DC Water Potomac River Tunnel – Civil Design for CSO Control

Civil engineering and traffic planning supporting DC Water’s Potomac River Tunnel construction.

Services:

As part of the DC Clean Rivers Project, DC Water is constructing the Potomac River Tunnel (PRT)—a 30,000-foot tunnel designed to reduce combined sewer overflows (CSOs) into the Potomac River and surrounding waterways. Extending from Georgetown University to Joint Base Anacostia-Bolling, the project also includes major surface infrastructure at seven CSO outfalls and a mining site at West Potomac Park.

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Precision Systems, Inc. (PSI) provided site civil engineering services to support the design-build delivery. PSI’s scope included upgrades to stormwater management, sanitary sewer systems, and utility infrastructure across multiple high-profile locations.

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To ensure constructability and minimize disruption, PSI performed detailed assessments of existing infrastructure and developed traffic management plans to maintain vehicle and pedestrian safety during construction. PSI’s work helped support the tunnel’s function of diverting excess flows to the Blue Plains Advanced Wastewater Treatment Plant, significantly improving regional water quality and advancing the District’s long-term environmental goals.

At a Glance

30,000 LF tunnel with 7 CSO outfall upgrades

Civil design for stormwater, sewer, and utility systems

Traffic management and constructability planning to reduce disruption

DC Water Potomac River Tunnel – Civil Design for CSO Control

Subsurface Utility Engineering (SUE) & Multimodal Design – Aspen Street & Wheeler Road, DC