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Lane, in a joint venture with Salini Impregilo, Lane’s parent company, worked on the design-build construction of a tunnel that runs from RFK Stadium traveling south down the Anacostia River to a junction shaft at Poplar Point in Washington, DC.

Year Life Span
Reduction in combined sewer overflows discharging untreated water to the Anacostia River
Award for Excellence


DC Water and Sewer Authority’s long term CSO control plan includes a system of tunnels to control combined sewer overflows into the Anacostia River, Rock Creek, and the Potomac River and transport those captured flows to the Blue Plains Advanced Wastewater Treatment Plant.

The Anacostia River Tunnel is one component of this long-term control plan. The project was completed in late 2017 and has contributed to an increased capacity of the District’s sewer system, significantly mitigating the frequency, magnitude, and duration of sewer flooding. It is also helping to improve the water quality of the Anacostia River.

Technical Highlights

Technical Details

The project consisted of the final design and construction of the following main components:

  • 12,500-foot long 23-foot diameter, reinforced concrete segmentally lined tunnel
  • Six shafts with various configurations that include hydraulic internal structures, vortex drop facilities, and diversion chambers
  • Two shafts constructed at CSO-019 and connected by an interconnecting tunnel constructed by Sequential Excavation Methods
  • Diversion chambers with connecting diversion sewers and approach channels at two shaft locations
  • Adit tunnels to connect the shafts to the tunnel at three shaft locations
  • Ventilation control facilities to regulate air flow in the tunnel system.


  • Sustainability Initiative of the Year (November 2017) from the International Tunneling and Underground Space Association (ITA-AITES)
  • 2018 ENR Global Award of Merit, Water/Wastewater
  • 2018 ENR Mid-Atlantic Award of Merit, Water/Environment