Template:Distinguish Template:Infobox body of water 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 Template:Convert southeast of Baraboo and Template:Convert NNW of Madison. The area around the lake is home to the Wisconsin wine appellation of the Lake Wisconsin AVA.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

It was formed by the construction of the Prairie du Sac Dam, 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 Template:Convert.<ref name=dnr>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> It has an area of Template:Convert.<ref name=dnr></ref>

Its construction effectively ended the Fox-Wisconsin Waterway connection to the Mississippi River, although commercial traffic had ended decades before completion of the dam.

The lake provides flood control and is a popular destination for recreational boating and fishing.

In 1966, the Wisconsin state record Common Carp was caught in Lake Wisconsin, weighing 57 lbs. 2 oz.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

The Merrimac Ferry crosses the lake at Merrimac, Wisconsin.

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