Krohns Lake
Krohns Lake in Kewaunee County, Wisconsin has a water quality grade of B (Good). Water clarity: 8 ft visibility. Phosphorus: 11.6 µg/L. Maximum depth: 38 ft. Surface area: 19 acres.
- Clarity
- 8 ft
- Max depth
- 38 ft
- Area
- 19 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Kewaunee County
Krohns Lake is a 19-acre mesotrophic lake in Kewaunee County, Wisconsin with a maximum depth of 38 feet. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Trout. Public access is available with 1 public boat landing. Compared to the 2 other monitored lakes in Kewaunee County, Krohns Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-10-18. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Moderate clarity, visible to about 8 ft. Phosphorus level: 11.6 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | Not graded |
| Phosphorus | 11.6 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Krohns Lake
Compare lakeside cabins, hotels, and vacation rentals near Krohns Lake in Kewaunee County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 38 ft |
| Surface Area | 19 acres |
| Public Access | Yes |
Recreation & Access
- Krohns LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Krohns 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.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2004. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Krohns Lake covering fish populations, stocking, water quality, and management. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2021Krohns Lake spring shocking survey, 2021Spring Shocking Survey · WI DNR · 2021 (PDF)
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.229 m/yr | 5 |
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Krohns Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Ebert Dairy Enterprises LlcPierce, Town Of · 0.8 mi away · NPDES WI0062235Recent violation
- El Na Farms LlcLincoln, Town Of · 3.9 mi away · NPDES WI0063061Recent violation
- Algoma Lumber Company IncAlgoma · 2.3 mi away · NPDES WI0052337
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.
County Ranking
Ranked #2 of 3 lakes in Kewaunee County
Nearby Lakes in Kewaunee County
Frequently asked questions about Krohns Lake
What is the water quality grade for Krohns Lake?
- Krohns Lake in Kewaunee County, Wisconsin has a water quality grade of B (Good). Water clarity: 8 ft visibility. Phosphorus: 11.6 µg/L. Maximum depth: 38 ft. Surface area: 19 acres.
Is Krohns Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Krohns Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Krohns Lake?
- Krohns Lake has a maximum depth of 38 feet. The lake covers 19 acres.
What fish are in Krohns Lake?
- Fish species found in Krohns Lake include Panfish, Largemouth Bass, Trout. Krohns Lake is located in Kewaunee County, Wisconsin.
Are there boat ramps on Krohns Lake?
- Krohns Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Krohns Lake. Public access is listed as yes.
Explore Krohns Lake across LakeGrade
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Moderate nutrients, good water quality
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Where this data comes from
53 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX53 samples · 2020–2025
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated 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