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Lake Profile


General Information

Description Lake Winnebago is the largest lake in Wisconsin, by both surface area and volume. It also has the longest shoreline in the state.

The lake is a remnant of a once much larger Glacial Lake Oshkosh.

Country United States of America
Latitude 44° 0' 0" (44.0000)
Longitude -88° 25' 0" (-88.4167)
State Wisconsin
Lake Region The Lake Winnebago Pool


 Winnebago locator map
 Winnebago Pool system map

Physical Characteristics

Description Winnebago is the largest inland lake in Wisconsin. It's watershed takes up approximately 12% of the entire state.
Volume 2.63 km3
Surface Area 557.00 km2
Depth Mean depth: 4.7 m
Maximum depth: 6.4 m
Residence Time 0.6 years
Type Fresh
Catchment Catchment size: 15,200.00 km2
Catchment/surface area ratio: 27:1


Economic Value
Major Cities

Watershed Management

Description There have been extensive efforts and resources devoted to improving water quality in Lake Winnebago. Public participation in water resource management decisions in the Fox-Wolf basin has been high.

Watershed Action Plan Implementation underway
Other Issues Nutrient pollution
Polluted runoff

Biodiversity Conservation

Description The Lake Winnebago Pool (which consists of Lake Winnebago, Poygan and Butte des Morts) is home to the largest self reproducing lake sturgeon population in North America (approximately 40,000 adult males and 8,000 adult females). The Winnebago Pool is also very important for Forster's tern.
Species of Concern


Wisconsin Lake Partnerships
Wisconsin Association of Lakes



About Winnebago Lake Sturgeon
ILEC Database
Lake Winnebago Tourism Information
Protecting Wisconsin Lakes
Using college interns to increase nutrient management adoption
Water and Sediment Control Basin/Grassed Waterway in Lake Winnebago
Winnebago Advisory Number 4264
Wisconsin Inland Waters with Zebra Mussels (1999)
Wisconsin's Aquatic Sciences Center


2/6/2003 - With spearing season ahead, fish in Lake Winnebago system could number up to 50,000
9/19/2002 - Invasive perch nearing Lake Winnebago

Additional Data Sources

Birkett, C., and I. Mason. 1995. A new global lakes database for remote sensing programme studying climatically sensitive large lakes. Journal of Great Lakes Research, 21 (3) 307-318.
International Lake Environment Committee, the United Nations Environment Program and Environment Agency, Government of Japan. 1997. World Lakes Database.
US EPA (2004) National Listing of Fish Advisories Database

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