Potomac River Tunnel

TBM Launched for Potomac River Tunnel
TBM Staff
April 10, 2026
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DC Water Hosts Ceremonial Launch of Potomac River Tunnel TBM
November 5, 2025
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DC Water to Hold Ceremonial Blessing for Potomac River Tunnel TBM
October 30, 2025
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Potomac River Tunnel Begins Controlled Underground Blasting
June 4, 2025
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Potomac Tunnel Project Underway: CBNA, Halmar, COWI & Hatch Join Forces
February 16, 2024
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National Park Service Approves DC Water’s Potomac River Tunnel

The National Park Service (NPS) has completed an Environmental Assessment (EA) and approved DC Water’s proposal to...

April 16, 2020