Lake Onalaska is a reservoir located on the Black River and Mississippi River between Wisconsin, and Minnesota. It is approximately 4 miles (6.4 km) across, and is the widest point on the Mississippi River. Located in La Crosse County in the state of Wisconsin, its latitude and longitude are 43°52′01″N 091°18′26″W. The lake is 7,688 acres (31.11 km2) and is shored by the city from which its name came from: Onalaska, Wisconsin.
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