Green Lake (Wisconsin)

Green Lake — also known as Big Green Lake (to distinguish it from Little Green Lake, which is near Markesan)— is a lake in Green Lake County, Wisconsin, United States. Green Lake has a maximum depth of 237 ft (72 m), making it the deepest natural inland lake in Wisconsin and the second largest by volume. The lake covers 29.72 km2 (7,340 acres) and has an average depth of 30.48 m (100.0 ft). Green Lake has 43.94 km (27.30 mi) of diverse shoreline, ranging from sandstone bluffs to marshes.

Green Lake
Big Green Lake
Green Lake
Green Lake
Hydrographic Map of Green Lake Wisconsin
LocationGreen Lake County, Wisconsin, United States
Coordinates43°49′28″N 88°57′52″W
TypeDimictic
EtymologyGreen appearance of the water
Part ofBig Green Lake Watershed
Primary inflowsSilver Creek,

White Creek, Dakin Creek, Hill Creek, Wurches Creek, Roy Creek, Spring Creek,

Assembly Creek
Primary outflowsPuchyan River
Catchment area277.9 km2 (107.3 sq mi)
Basin countriesUnited States
Managing agencyGreen Lake Association, Green Lake Sanitary District
Max. length11.75 km (7.30 mi)
Max. width3.219 km (2.000 mi)
Surface area2,973 ha (7,350 acres)
Average depth30.48 m (100.0 ft)
Max. depth72.24 m (237.0 ft)
Water volume0.9390 km3 (761,300 acre⋅ft)
Residence time21 years
Salinity502.80 - 532.88 uS/cm
Shore length143.94 km (27.30 mi)
Surface elevation242.3 m (795 ft)
Max. temperature27.2 °C (81.0 °F) Highest average, 2018
Frozen87 days
SettlementsGreen Lake, Wisconsin
1 Shore length is not a well-defined measure.
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