Cast Gill

Mauthe Lake

Fond du Lac County, Wisconsin · WBIC 38200

Official regulationsDNR lake mapDepth map (PDF)

The DNR has advice about eating fish from this water. How much is safe depends on the fish and on who is eating it. Look it up on the DNR site

Size

78 acres

Max depth

23 ft

DNR lake type

Complex, Warm, dark water color

Water clarity

6 ft

Moderate, measured Sep 2020

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

Mauthe Lake Access1

Numbered dots are boat landings; tap one for directions. The list below has the same numbers. Drawn from the DNR's 24K hydrography (surveyed 1974), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.

Water clarity

6 ft Secchi depthModerateOlder reading

Last measured Sep 10, 2020. 6 readings on record, 2019 to 2020.

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

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 Mauthe Lake - Deep Hole. Checked Oct 23, 2026.

Water temperature

A typical year Modeled estimate

  • Ice goes outabout Apr 8 (Apr 1 to Apr 13)
  • Surface reaches 48°Fabout Apr 21 (Apr 13 to Apr 26)
  • Surface reaches 64°Fabout May 11 (May 8 to May 14)
  • June surface74°F, usually 73 to 76°F
  • July surface80°F, usually 78 to 81°F
  • August surface76°F, usually 73 to 78°F

Forms a warm top layer around May 2, lasting about 148 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.

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.

Fishing from shore

Wisconsin DNR shore fishing sites. Checked Oct 24, 2026.

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
  • 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
  • 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
  • Fish consumption advice flagWisconsin DNR advisory areas (flag and link only), checked Oct 24, 2026
  • VHS statusWisconsin DNR VHS status by watershed, checked Oct 24, 2026
  • Shore fishing sitesWisconsin DNR shore fishing sites, 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.

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