Kettle Moraine Lake
Kettle Moraine Lake in Fond du Lac County, Wisconsin has a water quality grade of B (Good). Water clarity: 11 ft visibility. Phosphorus: 16.2 µg/L. Maximum depth: 30 ft. Surface area: 209 acres.
- Clarity
- 11 ft
- Max depth
- 30 ft
- Area
- 209 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
Next lake in Fond du Lac County
Kettle Moraine Lake is a 209-acre mesotrophic lake in Fond du Lac County, Wisconsin with a maximum depth of 30 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality is improving over recent sampling years. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Compared to the 8 other monitored lakes in Fond du Lac County, Kettle Moraine Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-27. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
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)
Good clarity, visible to about 11 ft. Phosphorus level: 16.2 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11 ft | Not graded |
| Phosphorus | 16.2 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Kettle Moraine Lake
Compare lakeside cabins, hotels, and vacation rentals near Kettle Moraine Lake in Fond du Lac 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 | 30 ft |
| Surface Area | 209 acres |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Kettle Moraine 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 2006. 9 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.003 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.69 µg/L/yr | 5 |
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Kettle Moraine Lake under Clean Water Act (NPDES) discharge permits.
- Second Look Holsteins LlcOsceola, Town Of · 3.7 mi away · NPDES WI0062987
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 #5 of 9 lakes in Fond du Lac County
Nearby Lakes in Fond du Lac County
Frequently asked questions about Kettle Moraine Lake
What is the water quality grade for Kettle Moraine Lake?
- Kettle Moraine Lake in Fond du Lac County, Wisconsin has a water quality grade of B (Good). Water clarity: 11 ft visibility. Phosphorus: 16.2 µg/L. Maximum depth: 30 ft. Surface area: 209 acres.
Is Kettle Moraine Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Kettle Moraine Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Kettle Moraine Lake?
- Kettle Moraine Lake has a maximum depth of 30 feet. The lake covers 209 acres.
What fish are in Kettle Moraine Lake?
- Fish species found in Kettle Moraine Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. Kettle Moraine Lake is located in Fond du Lac County, Wisconsin.
Explore Kettle Moraine Lake across LakeGrade
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Moderate nutrients, good water quality
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Where this data comes from
56 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX56 samples · 2020–2026
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)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes