Cast Gill

White Mound Lake

Sauk County, Wisconsin · WBIC 1258100

Official regulationsDNR lake map

The DNR lists this lake's watershed (Honey Creek) 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

104 acres

Max depth

16 ft

DNR lake type

Complex, Warm, dark water color

Water clarity

3.5 ft

Low, measured Aug 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

Whitemound County Park Boat Ramp1

Numbered dots are boat landings; tap one for directions. The list below has the same numbers. Drawn from the DNR's 24K hydrography (surveyed 1983), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.

Water clarity

3.5 ft Secchi depthLow

Last measured Aug 25, 2026. 128 readings on record, 2000 to 2026.

Typical summer clarity (June to September): 5 ft, moderate, from 81 readings (2013 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 White Mound Lake - Deep Hole. Checked Oct 23, 2026.

Water temperature

75.5°F surface, measured Aug 25, 2026

Measured near the surface (0.3 m down). A single reading, not a daily value.

A typical year Modeled estimate

  • Ice goes outabout Apr 5 (Mar 30 to Apr 11)
  • Surface reaches 48°Fabout Apr 20 (Apr 13 to Apr 26)
  • Surface reaches 64°Fabout May 7 (May 2 to May 12)
  • June surface76°F, usually 75 to 78°F
  • July surface82°F, usually 81 to 84°F
  • August surface78°F, usually 75 to 80°F

Forms a warm top layer around May 21, lasting about 101 days.

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

  • Walleyelast stocked 2018 (large fingerling); stocked in 3 years 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.

Boat landings

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

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More lakes in Sauk County

All Sauk 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
  • VHS statusWisconsin DNR VHS status by watershed, checked Oct 24, 2026

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

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