Lock and Dam No. 7, Navigation system on Mississippi River in Winona County and La Crosse County, United States.
Lock and Dam No. 7 is a navigation structure spanning the Mississippi River that allows vessels to pass through by raising or lowering water levels. The facility includes a lock chamber where boats enter to cross the water level difference created by the dam.
The United States Army Corps of Engineers built this structure from 1933 to 1937 as part of the Mississippi River navigation system. Major renovation work occurred from 1989 to 2002 to improve its operations.
The lock and dam system represents the engineering achievements that transformed the Mississippi River into a managed commercial waterway for regional development.
The structure can be viewed from accessible overlooks along the riverbank where visitors can watch vessels pass through. Plan your visit when water levels are active to see the locks in operation.
The structure contains five roller gates and eleven tainter gates that regulate water flow across Lake Onalaska, managing a catchment area of 62,340 square miles.
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