Heidmann Lake
Kewaunee County, Wisconsin23 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Heidmann Lake. Here is what has been measured.
- 34 ft max depth
- Public access
- Limited data
Heidmann Lake in Kewaunee County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 15 ft visibility. Maximum depth: 34 ft. Surface area: 23 acres.
Heidmann Lake is a 23-acre lake in Kewaunee County, Wisconsin with a maximum depth of 34 feet. Overall water quality is improving over recent sampling years. The lake supports 2 documented fish species including Largemouth Bass and Northern Pike. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-16. Methodology: how these readings are compared.
Heidmann Lake covers about 23 acres in Kewaunee County. It has one public boat landing. If you are planning to stay, you can search lake houses and cabins around Heidmann Lake on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
What Heidmann Lake is good for
From access and monitoring records, not editorial picks.
- Clear water15 ft of visibility
- Boat launch1 documented ramp
- Deep water34 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Heidmann Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Heidmann Lake
These are the measurements Wisconsin DNR publishes for Heidmann Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 15 ft down. TSI 38.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 15ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 38 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Heidmann Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
34 ft
Surface area
23 acres
Public access
Yes
Listed by Wisconsin DNR
Recreation & Access
- Heidmann Lake County ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Heidmann Lake
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Top-rated places to stay near Heidmann Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Heidmann Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water quality readings over time
2 seasons of samples on record (2023–2026). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving2 years
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Heidmann Lake under Clean Water Act (NPDES) discharge permits.
- Sandway Farm LlcFranklin, Town Of · 0.7 mi away · NPDES WI0066346
- Skyline Blue AcresFranklin, Town Of · 1.7 mi away · NPDES WI0063410
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Kewaunee County
Frequently asked questions about Heidmann Lake
Where is Heidmann Lake?
- Heidmann Lake is a lake in Kewaunee County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Heidmann Lake?
- Heidmann Lake in Kewaunee County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 15 ft visibility. Maximum depth: 34 ft. Surface area: 23 acres.
Is Heidmann Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Heidmann Lake?
- Heidmann Lake has a maximum depth of 34 feet. The lake covers 23 acres.
What fish are in Heidmann Lake?
- Fish species found in Heidmann Lake include Largemouth Bass, Northern Pike. Heidmann Lake is located in Kewaunee County, Wisconsin.
Are there boat ramps on Heidmann Lake?
- Heidmann Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Heidmann Lake County Park. Public access is listed as yes.
Can I fish at Heidmann Lake?
- Heidmann Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
Explore Heidmann Lake across LakeQuality
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Where this data comes from
1 measurement from 1 monitoring station, 2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX1 sample · 2026
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory