LOCK AND DAM NO. 4
'Lock and Dam No. 4' is a lock and dam located near Alma, Wisconsin and Kellogg, Minnesota on the Upper Mississippi River around river mile 752.8. It was constructed and placed in operation in May, 1935. Its last major rehabilitation was from 1988 to 1994. The dam consists of a concrete structure long with six roller gates, 22 tainter gates and an earth embankment long. The lock is wide by long. There were ten major injuries and three deaths recorded during construction of the facility.
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External links
★ USACE Lock and Dam 4
★ Survey number HAER WI-47 - Upper Mississippi River 9-Foot Channel, Lock & Dam No. 4, Alma, Buffalo County, WI
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