TRAFFIC ADVISORY: Water Street Northwest Construction Detours and Closures Beginning May 12th

May 05, 2025
Water Street Potomac River Tunnel Traffic Advisory

DC CLEAN RIVERS – POTOMAC RIVER TUNNEL PROJECT  

DC Water is advising the public of construction impacts starting on or about the week of May 12, 2025, in the 3500 block of Water Street Northwest near the Capital Crescent Trail, weather permitting. Temporary traffic lane closures, trail detours, and parking restrictions will be in effect to allow construction at the site for a facility to capture and divert sewer overflows to the river. 

The work is part of the ongoing Potomac River Tunnel Project to redirect combined sewer and stormwater during heavy rains through the tunnel to the Blue Plains Advanced Wastewater Treatment Plant. Signage will be posted to detour pedestrians, cyclists, motorists, and workers around the construction area. The Capital Crescent Trail will remain accessible while work is underway.

During this initial mobilization phase, the contractor will construct the following:

  • A new trail on the west side of the aqueduct to direct trail users around the construction site area. 
  • A path on the north side of Water Street to direct pedestrians and bicyclists under the aqueduct. 
  • Two lanes under the aqueduct: one for trail users and the Washington Canoe Club, and another for accessing the construction site. 

Water Street Northwest Work

  • Start Date: Week of May 12, 2025, weather permitting.
  • Time: Monday–Friday from 7:00 am – 7:00 pm
  • Location: 3500 block of Water St NW
  • Traffic Pattern Changes and Pedestrian/Bicycle Detours: 
    • Temporary traffic lane closure during non-peak hours, between 9:30 a.m. and 3:30 p.m. 
    • Parking restrictions will be implemented on the south side of Water Street, NW in front of the Potomac Boat Club
    • Pedestrian and Bicyclist Detours around the work zone. Flaggers will direct trail users. Please adhere to the flagger's directions and construction signage. 
  • See the map below for additional details.

Map of Water Street

Map: The traffic pattern changes begin near the Aqueduct. The Capital Crescent Trail will remain open to users. Parking restrictions will be in place in front of the Potomac Boat Club.

  • Commuters and pedestrians are advised to follow signage and flagging personnel directing them through the temporary closures. 
  • Please plan your travel routes accordingly and anticipate short delays. Traffic control measures will be in place to guide motorists safely through the area.

Project Details

DC Water is constructing the Potomac River Tunnel and support structures to capture combined sewer overflows (CSOs), a mixture of sewage and stormwater, and redirect it to DC Water's Blue Plains Advanced Wastewater Treatment Plant. The tunnel will begin operating in 2030. At the Capital Crescent Trail site location, DC Water is constructing an underground facility to connect to the sewer outfall and direct the overflows to the tunnel.

The project is needed to reduce overflows polluting the Potomac River and, ultimately, Chesapeake Bay. The tunnel also ensures compliance with the 2005 Federal Consent Decree entered by DC Water, the District of Columbia, the US Environmental Protection Agency, and the US Department of Justice, as amended in January 2016. The tunnel will reduce the volume of these overflows to the Potomac River by 93% and their frequency from approximately 74 events to four events in a year of average rainfall.

Learn more at: dcwater.com/prt

Contact Us

Project Email: dcpotomacrivertunnel@dcwater.com

Project Hotline: 202-972-1388

DC Water 24-hour Emergency: 202-612-3400

Latest News

Map of construction area on Clara Barton Parkway near I495

DC Water will be doing construction as part of a sanitary sewer rehabilitation project on Clara Barton Parkway in Maryland from Sept 8 - Oct 10, 2025, which may cause delays inbound near the I-495 Beltway interchange. One lane will be closed in the work zone to reline an 800-foot section of the sewer line, known as the Potomac Inteceptor. Access to the inner and outer loops of the Beltway will remain available. Additional lane closure may be necessary intermittently through Oct 24, 2025.

Image of new pipe section with wastewater flowing

Major Milestone in Sewer Line Repair Near Great Falls

DC Water has completed the final connection on the rehabilitated section of the Potomac Interceptor near Great Falls, renewing an integral part of the region's sewer system. This achievement signals the new pipe section is now fully operational and represents a significant step in completing this complex and critical infrastructure project.

Picture showing inside of Rock Creek Main Interceptor with large crack in crown

Weekend Closure of Rock Creek Multi-Use Trail Begins Friday evening, Oct 3 for Gate Restoration Work

DC Water is advancing to the next critical phase of the Rock Creek Main Interceptor (RCMI) repair project, following the discovery in May of structural vulnerabilities in the 72-inch diameter sewer line that carries over 100 million gallons of wastewater daily. These repairs are a high priority to prevent potential sewage discharge into Rock Creek.

Upcoming Meeting

Board of Directors Meeting

April 24, 2023

Monday 9:00 AM

Announcement

Aerial View of Construction near Watergate Complex Shows cranes and construction of drop shaft underway
Scaffolding Installation Begins near Watergate Complex for Potomac River Tunnel Project

Rock Creek and Potomac Parkway NW Beginning September 23, 2025, to Mid-November 2025

DC Water is installing temporary scaffolding at the Rock Creek Trail site, west of the Watergate Complex. Trail users are advised to adhere to flagger instructions during installation.

Scaffolding installation is expected to be completed by September 26, 2025, and will remain in place until mid-November 2025.

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
October 8, 2025
Wednesday, 9:30 AM

Customer Service Center Announcement

Payment Plan Incentive: provides a credit back of 40% of the last 3 payments made and in the new fiscal year 50% will be credited. 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.