Lake Winnebago

Lake Winnebago is a 137,700-acre (55,700 ha; 215.2 sq mi)freshwater lake in eastern Wisconsin, United States. It is the largest lake entirely within the state, covering an area of about 30 by 10 miles (48 by 16 km), with 88 miles (142 km) of shoreline, an average depth of 15.5 feet (4.7 m) and a maximum depth of 21 feet (6.4 m). It has many shallow reefs along the west shore, and a drop-off type shoreline on the east. There are several islands along the west shore.

Lake Winnebago has two primary tributaries, the Wolf River and the Fox River. It is drained by the Fox River which flows north towards Green Bay and serves as part of the Fox-Wisconsin Waterway. Lake Winnebago is part of a larger system of lakes in Wisconsin known as the Winnebago Pool.

Cities on its shores include Oshkosh, Fond du Lac, Neenah and Menasha. Municipal drinking water systems serving over 250,000 people draw directly from the lake, including systems serving the cities of Oshkosh, Neenah, Menasha and Appleton.