Construction crews will be working around the clock on the Rock Creek Main Interceptor (RCMI) project this weekend, requiring a section of the Rock Creek Multi-use Trail to be closed and changes in ...

Something big is happening underground, as DC Water marks a major step forward for the Potomac River Tunnel Project. Today, crews successfully lowered the massive cutterhead for the tunnel boring machine (TBM) Mary. The 21-foot diameter cutterhead acts as a giant drill, to cut through rock and soil as Mary excavates the northern section of tunnel.

Beginning the week of January 12, 2026, DC Water will begin the next phase of construction for the Potomac River Tunnel Project at the Georgetown University entrance site along the Canal Road NW.