Heidmann Lake
Kewaunee County, Wisconsin · WBIC 85200
The DNR lists this lake's watershed (East Twin River-Frontal Lake Michigan) 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
24 acres
Max depth
34 ft
DNR lake type
Simple, Warm, dark water color
Water clarity
12 ft
Clear, 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
Numbered dots are boat landings; tap one for directions. The list below has the same numbers. Drawn from the DNR's 24K hydrography (surveyed 1978), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
12 ft Secchi depthClear
Last measured Sep 17, 2026. 36 readings on record, 1993 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 HEIDMANN LAKE - DEEP HOLE. Checked Oct 23, 2026.
Water temperature
69.3°F surface, measured Sep 17, 2026
Measured near the surface (0.91 m down). A single reading, not a daily value.
A typical year Modeled estimate
- Ice goes outabout Mar 31 (Mar 24 to Apr 8)
- Surface reaches 48°Fabout Apr 18 (Apr 10 to Apr 20)
- Surface reaches 64°Fabout May 23 (May 13 to May 27)
- June surface71°F, usually 70 to 73°F
- July surface79°F, usually 76 to 80°F
- August surface76°F, usually 74 to 78°F
Forms a warm top layer around Apr 17, lasting about 181 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
Forecast: National Weather Service (no endorsement implied). Sunrise, sunset and moon phase are calculated. The moon phase can be a day off.
Boat landings
- 1Heidmann Lake AccessBoat ramp · Paved surface · County
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Kewaunee County
- Chada Lake0.3 miles away
- Engledinger Lake0.5 miles away
- Shea Lake1.0 miles away
- Stump Pond12 miles away
- West Alaska Lake17 miles away
- East Alaska Lake17 miles away
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
- 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
- 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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