DC Water invites you to explore one of the District's largest infrastructure projects during Potomac River Tunnel Community Day at the West Potomac Park construction site. 

Experience the project up close with guided site tours, opportunities to see and touch construction equipment, and family-friendly activities for all ages. Guests may also pre-register for an underground tour with access to the tunnel. 

The Potomac River Tunnel (PRT) is a 5.5-mile tunnel that will help reduce the mixture of stormwater and sewage overflows to the Potomac River from the Lincoln Memorial area to Georgetown, improving water quality and protecting the environment. The tunnel will begin operating in 2030.

Event Details
What: Potomac River Tunnel Community Day
When: Saturday, September 19, 2026, from 10:30 a.m. to 3 p.m.
Where: West Potomac Park Construction Site, 4592 Ohio Drive SW
Look for the large cranes!

Attendees must wear fully enclosed shoes.

Please RSVP for the Community Day activities and to participate in a tunnel tour: prtcommunityday.rsvpify.com 

Underground Tunnel Tours
Due to space and scheduling limitations, participation in the underground tunnel tour is limited and requires advance registration.

Six tour groups, each with up to 14 participants, will be offered throughout the day. Each tour will last approximately two hours and begin with a mandatory safety briefing and distribution of personal protective equipment.

Participants will descend 105 feet into the main shaft and walk a short distance into the tunnel to view the tunnel boring machine and learn more about tunnel construction. Tour guides will accompany participants throughout the tour.

To Participate in the Underground Tour, You Must:

• Be at least 18 years old
• Wear long pants, fully enclosed shoes, and socks
• Sign a liability and photo waiver
• Attend the mandatory safety orientation before your scheduled tour

DC Water will provide all required personal protective equipment, including muck boots, a hard hat, gloves, safety glasses, a flashlight, and a high-visibility safety vest.

Tour Schedule
Tour 1: 10:15 a.m. to 12 p.m.
Tour 2: 11:15 a.m. to 1 p.m.
Tour 3: 12:15 p.m. to 2 p.m.
Tour 4: 1:15 p.m. to 3 p.m.
Tour 5: 2:15 p.m. to 4 p.m.
Tour 6: 3:15 p.m. to 5 p.m.

Registration
To reserve a tunnel tour time, visit: prtcommunityday.rsvpify.com 
For additional information, email dcpotomacrivertunnel@dcwater.com.
Visit the project webpage: dcwater.com/prt.