Northbound 14th Street NW has turned into a no-go zone just south of Thomas Circle after engineers uncovered a century-old brick sewer tunnel under the roadway that officials say is at serious risk of collapsing. D.C. Water rushed in specialized crews to stabilize the tunnel and shore up the pavement above, a high-stakes fix that has jammed traffic for drivers heading toward the circle. The shutdown stretches from L Street NW up to Thomas Circle while crews work to make sure the street does not cave in.
What crews are doing
According to DC Water, crews are carefully filling the 42-inch, abandoned, brick-lined sewer tunnel with an engineered material designed to support the roadway and reduce the chance of further deterioration. The agency says the job requires specialized equipment and is expected to take several days, with a target of reopening the lanes by midweek, as long as the weather and on-site conditions cooperate.
How the problem was discovered
As reported by WTOP, D.C. Water spokesperson Sherri Lewis said crews first spotted the old tunnel after a nearby water-main break. They sent cameras into the line and found a 70-inch crack running along the tunnel’s crown. WUSA9 shared video and photos from inside the structure and noted that the tunnel has been abandoned for decades.
Traffic and neighborhood impacts
Drivers trying to head north are being pushed over to 13th or 15th streets, and pedestrians are being told to follow detour signs while the northbound side of 14th Street stays closed, according to local reports. Southbound lanes on 14th Street are still open, and utility partners are working alongside crews to locate nearby lines and keep service disruptions to a minimum, FOX 5 reports.
Why this matters
The emergency work highlights a larger issue with aging brick-lined sewers across the District, which D.C. Water has been inspecting and repairing as part of its long-term capital program. The Washington Post reported last year that crews discovered a 200-foot crack in a major brick tunnel dating back to the 1890s, and noted that fixes like these are bundled into a multi-year, multi-billion-dollar upgrade plan aimed at preventing environmental damage.
What to expect
Officials say the operation’s complexity means the northbound lanes could stay shut through the week, as crews cycle in specialized teams and equipment. Neighbors should be ready for detours, shifting traffic patterns, and occasional lane restrictions. For maps and the latest advisories, see DC Water.
