Lock and Dam No. 7, Navigation system on Mississippi River in Winona County and La Crosse County, United States.
Lock and Dam No. 7 spans across 10,860 feet with a lock chamber measuring 110 feet wide and 600 feet long for vessel passage.
The United States Army Corps of Engineers constructed this navigation structure between 1933 and 1937, with major upgrades completed from 1989 through 2002.
The lock and dam system represents the engineering achievements that transformed the Mississippi River into a managed commercial waterway for regional development.
The facility maintains a water level difference of 6 feet between upstream and downstream sections, enabling continuous navigation for commercial and recreational vessels.
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.
Location: Winona County
Location: La Crosse County
GPS coordinates: 43.86690,-91.30720
Latest update: March 13, 2025 11:37
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