Ramp Remains Closed Pending Further Assessment

DC Water has completed testing of the Rock Creek Main Interceptor—a major sewer line near the P Street NW ramp to Rock Creek and Potomac Parkway—after a sinkhole appeared on Friday. The results showed no significant leaks or structural issues in the sewer line.

An emergency closure was put in place out of an abundance of caution due to concerns that the roadway may have been compromised. Over the weekend, DC Water crews performed dye trace testing using a non-toxic, biodegradable dye to detect any leaks or defects and to trace flow into Rock Creek. The dye is safe for both the environment and public health.

DC Water’s sewer line was found to be in good condition. As the area falls under the jurisdiction of the National Park Service (NPS), DC Water is now turning over the site for further investigation and next steps.

For safety, the sinkhole has been covered with a steel plate. The ramp will remain closed while NPS conducts its own assessment and determines whether it is safe to reopen.

We appreciate the public’s patience as we worked quickly to assess the situation and ensure the area is safe.