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Breakwall, Black Rock Lock, Niagara River, Buffalo, New York, 03May14. (Photo © 2014 Jon Rieley-Goddard)
Lock and Dam 5 on the Upper Mississippi River in Minnesota City, Minn., has been dewatered this winter to allow the U.S. Army Corps of Engineers, St. Paul District, to complete major maintenance work on it. Each St. Paul District lock chamber is dewatered every 15 to 20 years for this major maintenance. Lock and Dam 5 was last dewatered in 1990. --Photo by Shannon Bauer, U.S. Army Corps of Engineers