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TBM build-up begins for Potomac River Tunnel bore

DC Water lowers TBM cutterhead underground, ready to begin boring the Potomac River Tunnel

Duncan Moore
The cutterhead for the TBM Mary being lowered into place, ready for work to begin on the Potomac River Tunnel Project

The cutterhead for the TBM Mary being lowered into place, ready for work to begin on the Potomac River Tunnel Project | Credits: DC Water

DC Water has marked a major step forward for the Potomac River Tunnel Project as crews successfully lowered the massive cutterhead for the tunnel boring machine (TBM) Mary. The 21ft diameter cutterhead...

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