Dewatering Elizabeth Dam
Crews with the Pittsburgh District's Repair Party work to dewater one of the oldest operating locks in the Army Corps of Engineers' national inland waterways system. Dewatering the main chamber at the 107-year-old Monongahela River Locks and Dam #3 at Elizabeth, Pennsylvania, requires extensive planning and preparation, even before the first drop of water is pumped from the chamber. The aging walls must be braced prior to emptying the chamber to compensate for the loss of hydrostatic pressure normally provided by water. Coffer dams must be installed outside the lock gates to provide workers a dry space in which to repair and replace components that are typically underwater. Skilled workers at the district's Pittsburgh Engineers Warehouse and Repair Station (PEWARS) must fabricate many of the broken, deteriorated and unique replacement components months prior to the maintenance work at Elizabeth. The district's fleet of cranes, barges and service vessels and its workforce of specialists and technicians converged on the site in mid-June to complete the six-week maintenance cycle.

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Photo by: USACE |  VIRIN: 140624-A-CE999-858.JPG