Little Horn Lake
Little Horn Lake in Oconto County, Wisconsin has a water quality grade of B (Good). Water clarity: 13.3 ft visibility. Phosphorus: 14.1 µg/L. Maximum depth: 25 ft. Surface area: 25 acres.
Wisconsin DNR lists Panfish as present on Little Horn Lake. DNR survey details →
- Clarity
- 13.3 ft
- Max depth
- 25 ft
- Area
- 25 acres
- Type
- Mesotrophic
- Trend
- → Stable
- Public access
- Yes
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Little Horn Lake is a 25-acre mesotrophic lake in Oconto County, Wisconsin with a maximum depth of 25 feet. Water quality is graded B based on 1 sampling years through 2026. Water clarity is declining over recent sampling years. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 2 public boat landings. Compared to the 38 other monitored lakes in Oconto County, Little Horn Lake ranks #21 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-30. Grade methodology: LakeQuality 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 13.3 ft. Phosphorus level: 14.1 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.3 ft | Not graded |
| Phosphorus | 14.1 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Little Horn Lake
Compare lakeside cabins, hotels, and vacation rentals near Little Horn Lake in Oconto 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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Wisconsin DNR lists Panfish as present on Little Horn Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Little Horn Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2003. 3 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 25 ft |
| Surface Area | 25 acres |
| Public Access | Yes |
Recreation & Access
- McCaslin BrookPublic
- Reservoir PondPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Little Horn 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 Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.8 m/yr | 7 |
| Phosphorus | ↑ Improving | -1.05 µg/L/yr | 5 |
County Ranking
Ranked #21 of 39 lakes in Oconto County
Nearby Lakes in Oconto County
Frequently asked questions about Little Horn Lake
Where is Little Horn Lake?
- Little Horn Lake is a lake in Oconto County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Little Horn Lake?
- Little Horn Lake in Oconto County, Wisconsin has a water quality grade of B (Good). Water clarity: 13.3 ft visibility. Phosphorus: 14.1 µg/L. Maximum depth: 25 ft. Surface area: 25 acres.
Is Little Horn Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Little Horn Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Little Horn Lake?
- Little Horn Lake has a maximum depth of 25 feet. The lake covers 25 acres.
What fish are in Little Horn Lake?
- Fish species found in Little Horn Lake include Panfish, Largemouth Bass, Northern Pike. Little Horn Lake is located in Oconto County, Wisconsin.
What did the DNR fisheries survey find at Little Horn Lake?
- Wisconsin DNR lists Panfish as present on Little Horn Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Little Horn Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Little Horn Lake?
- Little Horn Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include McCaslin Brook, Reservoir Pond. Public access is listed as yes.
Explore Little Horn Lake across LakeQuality
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Moderate nutrients, good water quality
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Where this data comes from
69 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_WQX69 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
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory