Anacostia River Tunnel Construction Brings Closure to I-295 Southbound Onramp

September 15, 2016

(Washington, DC) – DC Water is performing construction activities as a part of the Anacostia River Tunnel Project.

Construction will consist of building six shafts along the tunnel to serve as access points for the tunnel and to assist in diverting Combined Sewer Overflows (CSOs) to the Anacostia River Tunnel.

Beginning Wednesday, September 14, 2016 through Monday, February 27, 2017, weather permitting; the I-295 Southbound entrance ramp at eastbound Suitland Parkway will be closed to all oncoming traffic between the hours of 7:00pm at night to 1:00pm the following day. It is advised that southbound South Capitol Street, SE to Overlook Avenue, SE be used as an alternative route for travel to I-295 southbound during the hours of closure.

Important Information:
All traffic lanes on the I-295 Southbound onramp at eastbound Suitland Parkway will be closed from 7:00pm at night to 1:00pm the following day. It is advised that southbound South Capitol Street, SE to Overlook Avenue, SE be used as an alternative route for travel to I-295 southbound.

The entrance ramp will be open only during rush hours daily from 1:00pm to 7:00 pm and closed at all other times.

Traffic will be diverted beginning September 14, 2016 and the ramp will remain closed through February 27, 2017, weather permitting.

Temporary traffic signs will be set up throughout the area to alert motorists of the upcoming closure.

Some traffic delays within the vicinity of the work zones are anticipated.

Noise levels will be closely monitored during construction.

Project Details:
DC Water is constructing the Anacostia River Tunnel, which consists of six shafts located along the tunnel to serve as access points for the tunnel and to assist in diverting Combined Sewer Overflows (CSOs) to the Anacostia River Tunnel. The project will also include diversion and order control structures at 5 locations along the tunnel alignment. This infrastructure improvement is a major component of the DC Clean Rivers Project that will reduce CSOs annually by 96 percent throughout the system and by 98 percent for the Anacostia River alone.

This portion of the project, which includes the I-295 Southbound entrance ramp at eastbound Suitland Parkway closure will allow for retrieval of the tunnel boring machine once it has completed mining the Anacostia River Tunnel and completion of the construction of the Poplar Point Junction Shaft.

###

For more information on the DC Clean Rivers Project, visit dcwater.com/cleanrivers.

Latest News

photo inside tunnel with geopolymer

Reinforcement of the upstream section of the Potomac Interceptor has been completed, marking the halfway point in emergency repairs following the January 19 sewer line collapse. Crews continue to advance repairs on schedule, with full project completion expected by mid-March.

John Cassidy, Matt Brown, David L. Gadis, and Moussa Wone giving technical briefing

DC Water today is releasing a comprehensive assessment detailing the condition of the Potomac Interceptor and our emergency response to the January 19 sanitary sewer line failure. This report provides ...

Geopolymer lining inside the Potomac Interceptor

DC Water and its contractor have taken significant steps toward repairing the Potomac Interceptor. The repair process currently underway involves reinforcing the damaged section of the pipe using geopolymer. This material is known for its concrete-like strength and durability.

Upcoming Meeting

Board of Directors Meeting

April 24, 2023

Monday 9:00 AM

Announcement

Picture of new bike pedestrian path and traffic detour
New Path for Capital Crescent Trail Opens at Georgetown Waterfront Park

DC CLEAN RIVERS – POTOMAC RIVER TUNNEL PROJECT
If you bike, drive, or walk through Georgetown, we’ve got changes starting this week around the Potomac River Tunnel construction on Water Street NW. The Capital Crescent Trail has a new temporary detour through Georgetown Waterfront Park, open now for cyclists between 33rd and Potomac streets NW.

Latest Blog Post
A helicopter lowers a drill rig to workers on the Potomac River.
DC Water begins drilling in Potomac River to explore options to rehab underwater sewer line
When one of your major sewer lines runs through the Potomac River, a backhoe and trencher won't do. That's why we've got helicopters carrying a 14-ton drill and workers suspended midair over the Potomac.
Upcoming Meeting
Date
March 11, 2026
Wednesday, 9:30 AM

Upcoming Events

Customer Service Center Announcement

Payment Plan Incentive: provides a credit back of 50% of the last 3 payments made. Eligible participants are residential customers who have had an outstanding balance for 60 days or greater and with an outstanding balance of $500 or more.