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Lake Onalaska
Location Wisconsin
Coordinates 43°52′01″N 091°18′26″W / 43.86694°N 91.30722°W / 43.86694; -91.30722Coordinates: 43°52′01″N 091°18′26″W / 43.86694°N 91.30722°W / 43.86694; -91.30722
Lake type reservoir
Primary inflows Mississippi River
Primary outflows Mississippi River
Basin countries United States
Max. length 4 miles
Max. width 3.75 miles
Surface area 7,688 acres (3,111 ha)
Max. depth 43 ft (13 m)
Surface elevation 633 ft (193 m)
Settlements Onalaska

Lake Onalaska is a reservoir located on the Mississippi River between Wisconsin, and Minnesota.[1] It is approximately 4 miles across, and is the widest point on the Mississippi River.[2] Located in La Crosse County in the state of Wisconsin, its latitude and longitude are 43°52′01″N 091°18′26″W / 43.86694°N 91.30722°W / 43.86694; -91.30722 (Lake Onalaska). The lake is 7,688 acres and is shored by the city from which its name came from: Onalaska, Wisconsin. It sits at an altitude of 633 feet (193 meters) and is 43 feet deep at its deepest.[3][4]



Thomas G. Rowe (New York) and John C. Laird (Pennyslvania) platted the village of Onalaska, together, in 1851. Rowe chose the name from a poem by Thomas Campbell called “The Pleasures of Hope” published in 1799. The line “The wolf’s long howl from Oonalaska’s shore,” inspired his choice. The village, located in a heavy river-access area, became important in the lumber industry.[5]

In the 1930’s, as a series of Lock and Dam systems were being implemented throughout the Upper Mississippi area, Lock and Dam No. 7 was built to dam the Black River, creating the reservoir Lake Onalaska.[6][7]

The name for Lake Onalaska is derived from the name of the village (now city) of Onalaska and the rural town of Onalaska, both of which border the shores of the lake. Lake Roosevelt and Lake Leisure were, at one time, both considered possible names for what is now known as Lake Onalaska. It is full of seaweed, and cannot be found on googlemaps.


Lake Onalaska is a popular upper Mississippi destination that attracts visitors year round. Summer visitors enjoy a variety of activities from waterskiing, boating, windsurfing, fishing to beach picnics and bird-watching. The lake contains a variety of migratory waterfowl,[8] and fish, including Northern Pike, Bluegill, Crappie, Walleye and Large and Smallmouth Bass.[9]

In the fall, the bluffs surrounding the Mississippi River and Lake Onalaska explode into rich tones of reds and golds, drawing tourists from across the country.

In the winter, when the lake freezes over and the ice fishing season begins, Lake Onalaska is often dotted with dozens of tents.


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