Cast Gill

Mud Flat Lake

Bayfield County, Wisconsin · WBIC 2769400

Official regulationsDNR lake map

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

Size

11 acres

Max depth

30 ft

DNR lake type

Complex, Warm, clear water color

Water clarity

18.5 ft

Clear, measured Jun 2004

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

Drawn from the DNR's 24K hydrography (surveyed 1990), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.

Water clarity

18.5 ft Secchi depthClearOlder reading

Last measured Jun 4, 2004. 2 readings on record, 2002 to 2004.

Only a few readings are on record.

Nothing has been measured in the last 5 years, so this may not match the lake today.

Measured at the monitoring station named “Little Phantom(Mud Flat) Lake - Center”.

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 Little Phantom(Mud Flat) Lake - Center. Checked Oct 23, 2026.

Water temperature

A typical year Modeled estimate

  • Ice goes outabout Apr 18 (Apr 14 to Apr 24)
  • Surface reaches 48°Fabout Apr 26 (Apr 17 to May 2)
  • Surface reaches 64°Fabout May 18 (May 11 to Jun 1)
  • June surface71°F, usually 69 to 72°F
  • July surface77°F, usually 76 to 78°F
  • August surface73°F, usually 72 to 75°F

Forms a warm top layer around Apr 26, lasting about 159 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.

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.

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Where this comes from

  • Size, depth and lake typeWisconsin DNR lake classifications, checked Oct 23, 2026
  • OutlineWisconsin DNR 24K hydrography, checked Oct 23, 2026
  • Regulations linkWisconsin DNR fishing regulations (linked, not restated), checked Oct 23, 2026
  • Water clarityWisconsin 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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