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 of long stretch of C & O Canal with soil removed

DC Water has excavated a section of the Potomac Interceptor along Clara Barton Parkway, outside the I-495 Beltway as part of the accelerated rehabilitation of more than 2700 linear feet of the interceptor that was previously planned. As part of the long-term rehabilitation project, crews are beginning to remove trees which is necessary to construct a bypass chamber that will divert wastewater around sections of the pipe while they are being rehabilitated.

The shields for the tunnel boring machine Mary being lowered by cranes into the shaft

Recognition highlights DC Water’s commitment to environmental stewardship during Earth Month

DC Water has been honored with the “Green Bond of the Year – US Muni Bond” Award by Environmental Finance, a leading industry publication. This achievement celebrates DC Water’s leadership in sustainability and its dedication to responsible municipal financing.

Placeholder DC Water Image

DC Water issues the following statement in response to the complaints filed by the Maryland Office of the Attorney General and the Department of Justice on behalf of the U.S. Environmental Protection ...

Upcoming Meeting

Board of Directors Meeting

April 24, 2023

Monday 9:00 AM

Announcement

The shields for the tunnel boring machine Mary being lowered by cranes into the shaft
DC Water Earns Prominent Award for Sustainable Finance Leadership through Green Bonds

Recognition highlights DC Water’s commitment to environmental stewardship during Earth Month

DC Water has been honored with the “Green Bond of the Year – US Muni Bond” Award by Environmental Finance, a leading industry publication. This achievement celebrates DC Water’s leadership in sustainability and its dedication to responsible municipal financing.

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
April 28, 2026
Tuesday, 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.