Jules McCallum, a maintenance work leader for the Medium Capacity Fleet, guides a cage in position that will be used for an underwater inspection at Montgomery Locks and Dam, operated by the U.S. Army Corps of Engineers Pittsburgh District, on the Ohio River in Beaver County, Pennsylvania, Aug. 2, 2021. The medium fleet crew began work at Montgomery L/D in late July, and they will spend approximately a month to replace and repair components of the gate system and valves. (U.S. Army Corps of Engineers Pittsburgh District photo by Michel Sauret)