Cast Gill

Lake Winnebago

Fond du Lac County, Wisconsin · WBIC 131100

Official regulationsDNR lake mapDepth map (PDF)

The DNR lists this lake's watershed (Lake Winnebago) as suspect or infected with VHS, a fish virus. The listing covers the watershed, not a test of this lake. About VHS

This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations

Size

137,708 acres

Max depth

21 ft

DNR lake type

Complex, Warm, dark water color

Water clarity

2.5 ft

Low, measured Sep 2026

A warm-water lake type: the DNR groups it with lakes that warm up through summer. This describes the lake type in general, not this lake in particular.

Outline

Fisherman's Park Boat Ramp1Columbia Park Boat Launch2Lighthouse Harbor Boat Ramp3Lakeside Park - West Boat Ramp4Lakeside Park Boat Ramp5Hwy 45 Wayside Park Boat Ramp6Ecker Lakeland Road Access7Mill Street Boat Ramp8Recreation Park Boat Ramp9Grundman Park Boat Landing10Asylum Point Park & Boat Landing11Doemel Point Access12Lake Winnebago Access13Menominee Park Boat Ramp14Nagy Park/Black Wolf Boat Landing1524th Avenue Boat Launch16Calumet County Park Access17Stockbridge Harbor18High Cliff State Park Marina19Brothertown Harbor20Fugleburg Park Boat Ramp21Doty Park Boat Ramp22

Numbered dots are boat landings; tap one for directions. The list below has the same numbers. Drawn from the DNR's 24K hydrography (surveyed 1975), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.

Water clarity

2.5 ft Secchi depthLow

Last measured Sep 10, 2026. 208 readings on record, 1990 to 2026.

Typical summer clarity (June to September): 2.8 ft, low, from 79 readings (2012 to 2026).

Secchi depth is how far down a white disk stays visible. A bigger number means clearer water. Clear means a Secchi depth of 10 feet or more, moderate 5 to 10 feet, low under 5 feet.

Wisconsin DNR water monitoring (volunteer and staff), via the Water Quality Portal; station LAKE WINNEBAGO - DEEP HOLE-SOUTH END. Checked Oct 23, 2026.

Water temperature

74.3°F surface, measured Sep 10, 2026

Measured near the surface (1 m down). A single reading, not a daily value.

A typical year Modeled estimate

  • Ice goes outabout Apr 1 (Mar 27 to Apr 10)
  • Surface reaches 48°Fabout Apr 19 (Apr 7 to Apr 24)
  • Surface reaches 64°Fabout May 24 (May 14 to May 26)
  • June surface73°F, usually 72 to 76°F
  • July surface80°F, usually 78 to 81°F
  • August surface77°F, usually 75 to 79°F

Mixes regularly through the summer instead of forming a warm top layer.

A computer model of this lake's typical weather and water, built from 15 years, 2005 to 2019. Ranges show the middle half of years. The model was not calibrated against measured temperatures for this lake. It is an estimate, not a measurement.

Measured: Wisconsin DNR via the Water Quality Portal (checked Oct 23, 2026). Modeled: U.S. Geological Survey lake temperature data release (doi:10.5066/P9CA6XP8).

Today at the lake

Loading today's forecast…

Forecast: National Weather Service (no endorsement implied). Sunrise, sunset and moon phase are calculated. The moon phase can be a day off.

Stocking history

  • Muskellungelast stocked 2024 (large fingerling); stocked in 2 years since 2010
  • Lake Sturgeonlast stocked 2012 (yearling); stocked in 1 year since 2010
  • Saugerlast stocked 2010 (fry); stocked in 1 year since 2010

Stocking shows what was added to the lake, not what is in it now.

Wisconsin DNR annual fish stocking summary. Checked Oct 23, 2026.

Fish recorded near this lake

Recorded in open fish survey and museum records (GBIF). A record shows a fish was found near this lake in that year, not that it is there now, and says nothing about how many. Most coordinates are rounded to about 1 km, so a record is attached only when one lake is the clear match.

Open fish survey and museum records from GBIF; datasets are listed on the sources page. Checked Oct 23, 2026.

Boat landings

Wisconsin DNR public boat access sites. Checked Oct 23, 2026.

Water level and flow

Loading current readings…

U.S. Geological Survey gauges at or beside this lake. Readings are provisional and fetched when you open the page.

Share this lake

More lakes in Fond du Lac County

All Fond du Lac County lakes

Where this comes from

  • Size, depth and lake typeWisconsin DNR lake classifications, checked Oct 23, 2026
  • OutlineWisconsin DNR 24K hydrography, checked Oct 23, 2026
  • Stocking historyWisconsin DNR annual fish stocking summary, checked Oct 23, 2026
  • Regulations linkWisconsin DNR fishing regulations (linked, not restated), checked Oct 23, 2026
  • Boat landingsWisconsin DNR public boat access sites, checked Oct 23, 2026
  • Water clarityWisconsin DNR water monitoring, via the Water Quality Portal, checked Oct 23, 2026
  • Measured temperatureWisconsin DNR water monitoring, via the Water Quality Portal, checked Oct 23, 2026
  • Typical-year temperatureU.S. Geological Survey lake temperature model (modeled estimate), checked Oct 23, 2026
  • Fish recordedOpen fish survey and museum records, via GBIF, checked Oct 23, 2026
  • Water level and flowU.S. Geological Survey gauges (readings are live), checked Oct 23, 2026
  • VHS statusWisconsin DNR VHS status by watershed, checked Oct 24, 2026
  • Depth map linkWisconsin DNR lake maps list, checked Oct 24, 2026

See data sources for what each source covers, and about for how the numbers are matched to lakes.

Something wrong on this page? Report a problem.