Horn Lake
Horn Lake in Oconto County, Wisconsin has a water quality grade of B (Good). Water clarity: 8.8 ft visibility. Phosphorus: 14.5 µg/L. Maximum depth: 11 ft. Surface area: 131 acres.
Wisconsin DNR lists Panfish as common on Horn Lake. DNR survey details →
- Clarity
- 8.8 ft
- Typical in June
- 75°F
- Max depth
- 11 ft
- Area
- 131 acres
- Type
- Mesotrophic
- Trend
- → Stable
- Public access
- Yes
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Horn Lake is a 131-acre mesotrophic lake in Oconto County, Wisconsin with a maximum depth of 11 feet. Water quality is graded B based on 1 sampling years through 2026. Water clarity is declining over recent sampling years. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 38 other monitored lakes in Oconto County, Horn Lake ranks #24 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-19. 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)
Moderate clarity, visible to about 8.8 ft. Phosphorus level: 14.5 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.8 ft | Not graded |
| Phosphorus | 14.5 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Horn Lake
Compare lakeside cabins, hotels, and vacation rentals near 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.
Top-rated places to stay near Horn Lake
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Water Temperature
Horn Lake typically sits around 75°F at the surface in June. Summer average is about 75°F. Usually warmest in Jun (about 75°F) and coldest in Nov (about 48°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 8 field readings (2024–2025) via the EPA Water Quality Portal. See the full Horn Lake water temperature breakdown →
Wisconsin DNR lists Panfish as common on Horn Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades 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. 6 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 11 ft |
| Surface Area | 131 acres |
| Public Access | Yes |
Recreation & Access
- Horn LakePublic
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 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 | -0.848 m/yr | 7 |
| Phosphorus | ↑ Improving | -1.14 µg/L/yr | 5 |
County Ranking
Ranked #24 of 39 lakes in Oconto County
Nearby Lakes in Oconto County
Frequently asked questions about Horn Lake
Where is Horn Lake?
- 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 Horn Lake?
- Horn Lake in Oconto County, Wisconsin has a water quality grade of B (Good). Water clarity: 8.8 ft visibility. Phosphorus: 14.5 µg/L. Maximum depth: 11 ft. Surface area: 131 acres.
Is Horn Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Horn Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Horn Lake?
- Horn Lake typically sits around 75°F at the surface in June, from 8 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Horn Lake?
- Horn Lake has a maximum depth of 11 feet. The lake covers 131 acres.
What fish are in Horn Lake?
- Fish species found in Horn Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. Horn Lake is located in Oconto County, Wisconsin.
What did the DNR fisheries survey find at Horn Lake?
- Wisconsin DNR lists Panfish as common on Horn Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades 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 Horn Lake?
- Horn Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Horn Lake. Public access is listed as yes.
Explore Horn Lake across LakeQuality
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Moderate nutrients, good water quality
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Mesotrophic Lakes in Wisconsin
Where this data comes from
18 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_WQX18 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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory