Two new lock chambers, each measuring 84-feet by 720-feet, will be constructed at the location of the existing Lock 4, on the Monongahela River. The new lock construction will be sequenced such that the main lock chamber remains operational until the new river chamber is constructed. Once the river chamber is in place, the existing land chamber will be closed and the new land chamber will be constructed.

Tetra Tech INCA prepared Design Documentation Reports (DDRs) and final design of the new lock structures.

 Charleroi Gate and Valve Monolith (112.18 kB)

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