Lake Wisconsin

Coordinates: 43°18′36″N 89°43′29″W / 43.31000°N 89.72472°W / 43.31000; -89.72472
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Lake Wisconsin
Aerial view of the Prairie du Sac Dam, which impounds Lake Wisconsin, taken during the June 2008 flood.
Lake Wisconsin is located in Wisconsin
Lake Wisconsin
Lake Wisconsin
LocationColumbia / Sauk counties, Wisconsin, United States
Coordinates43°18′36″N 89°43′29″W / 43.31000°N 89.72472°W / 43.31000; -89.72472
Lake typereservoir
Primary inflowsWisconsin River
Primary outflowsWisconsin River
Basin countriesUnited States
Surface area9,500 acres (3,800 ha)
Max. depth40 ft (12 m)
Surface elevationabout 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 miles (8.0 km) southeast of Baraboo and 25 miles (40 km) NNW of Madison. Today it is home to the Wisconsin wine appellation of the Lake Wisconsin AVA.[1]

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 24 feet (7.3 m).[2] It has an area of 7,197 acres (29.13 km2).[2]

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.[3]

The Merrimac Ferry crosses the lake at Merrimac, Wisconsin.


  1. ^ Novak, Steven. "Fish Lake Wisconsin - Columbia County, Wisconsin". Lake-Link. Retrieved 2021-10-17.
  2. ^ a b "Wisconsin Lakes".
  3. ^ "Hook and Line Record Fish". Wisconsin DNR. Retrieved 30 December 2020.

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