Mini cofferdam
The 42.5-ton Louisville District-made dewatering box was lowered into place for the first time over three wickets Sept. 17 in the dam at Locks and Dam 52 on the lower Ohio River in preparation for repair work on the deteriorating concrete wicket sill. The box functions as a mini coffer dam to protect workers from the current and permit them to make repairs in a dry environment. The box's project engineer Keith Fleck (upper right) and lock and dam repairman Charles Smith are pictured inside the box and below the waterline of the upper pool with one of the pumps being used for removing the river water. Divers usually perform repairs in the murky waters around wicket dams and this will be the first time since the project was completed in 1929 that the naked eye has seen the concrete sill out of water.

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Photo by: Jon Fleshman |  VIRIN: 130918-A-XN645-002.JPG