Aerial view of the Prairie du Sac Dam, which impounds Lake Wisconsin, taken during the June 2008 flood.
|Location||Columbia / Sauk counties, Wisconsin, United States|
|Primary inflows||Wisconsin River|
|Primary outflows||Wisconsin River|
|Basin countries||United States|
|Surface area||9,500 acres (3,800 ha)|
|Max. depth||40 ft (12 m)|
|Surface elevation||about 774 ft (236 m)|
Lake Wisconsin is a reservoir on the Wisconsin River in southern Wisconsin in the United States. It is located in Columbia and Sauk counties, approximately 5 mi (8 km) southeast of Baraboo and 25 mi (40 km) NNW of Madison. Today it is home to the Wisconsin wine appellation of the Lake Wisconsin AVA.
It was formed by the construction of a dam at Prairie du Sac, which was begun in 1911 and completed in 1914. It is part of the Wisconsin River system of reservoirs. The lake has a maximum depth of 40 ft (12 m). It has a shoreline of 57 mi (90 km) and an area of 9500 acres (38 km²).
The lake provides flood control and is a popular destination for recreational boating and fishing.
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