• Corporate HQ, NY
  • Melville, NY
  • Iselin, NJ
  • Ossining, NY
  • Mount Laurel, NJ

Anacostia River Tunnel, Division H


The District of Columbia Water and Sewer Authority (DC Water) has been implementing its $2.6 billion long-term control plan for combined sewer overflows (CSOs), known as the DC Clean Rivers Project (DCCR), since 2012. The DCCR is comprised of 20 miles of 23-foot-diameter tunnels at depths from 50 to 160 feet. The deep-tunnel system will capture CSOs and convey them to the Blue Plains Advanced Wastewater Treatment Plant prior to discharge to the Potomac River.

The Anacostia River Tunnel (ART) section, the second tunnel of the CSO tunnel system, will convey CSOs along the Anacostia River in SE Washington, DC, reducing CSOs to the Anacostia River by 98%.

HAKS, as a member of the consultant construction management (CCM) team, inspected the $253 million design-build project, including construction of a 12,255-foot-long bored tunnel to a depth of 80 to 100 feet; six drop shafts; three tie-in adits; near-surface structures; and a mined tunnel.  The main tunnel was excavated by a tunnel boring machine utilizing the soft ground earth pressure balance method. 

The ART is now connected to the Blue Plains Tunnel at Poplar Point Junction Shaft.  CCM team members worked closely with the design-build team to ensure that underground construction complied with quality assurance guidelines.

The project received the Sustainability Initiative of the Year Award from the International Tunnelling and Underground Space Association.