Clear Lake
Clear Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Phosphorus: 10.8 µg/L. Maximum depth: 95 ft. Surface area: 873 acres.
Wisconsin DNR lists Panfish as common on Clear Lake. DNR survey details →
- Max depth
- 95 ft
- Area
- 873 acres
- Type
- Oligotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Clear Lake is a 873-acre cold, clear oligotrophic lake in Oneida County, Wisconsin with a maximum depth of 95 feet. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 2 public beaches. Compared to the 66 other monitored lakes in Oneida County, Clear Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-08-17. 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)
No clarity data. Phosphorus level: 10.8 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 10.8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Clear Lake
Compare lakeside cabins, hotels, and vacation rentals near Clear Lake in Oneida 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 Clear Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Blue-Green Algae (Cyanobacteria)
There’s no recent EPA CyAN cyanobacteria estimate for Clear Lake — clouds, ice, or an off-season gap in coverage. The most recent reading was high (285,759 cells/mL) on November 22, 2025.
Blue-green algae can appear and clear within days, so check your state’s current advisory before swimming. EPA CyAN ↗
Wisconsin DNR lists Panfish as common on Clear Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Clear Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 2 years of monitoring is improving. 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. 2 stations on file (most recent sample 2023).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 95 ft |
| Surface Area | 873 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Clear 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: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -0.5 µg/L/yr | 2 |
EPA Impairment Status
Clear Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10008935 · Official waterbody report · Matched by proximity (2.85 km)
County Ranking
Ranked #4 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Clear Lake
Where is Clear Lake?
- Clear Lake is a lake in Oneida County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Clear Lake?
- Clear Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Phosphorus: 10.8 µg/L. Maximum depth: 95 ft. Surface area: 873 acres.
Is Clear Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Clear Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Clear Lake?
- Clear Lake has a maximum depth of 95 feet. The lake covers 873 acres.
What fish are in Clear Lake?
- Fish species found in Clear Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Trout, Walleye. Clear Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Clear Lake?
- Wisconsin DNR lists Panfish as common on Clear Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Clear Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 2 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Does Clear Lake have blue-green algae?
- There is no recent EPA CyAN cyanobacteria estimate for Clear Lake (clouds, ice, or an off-season gap). The most recent reading was high (285,759 cells/mL). Blue-green algae can appear and clear within days, so check Wisconsin's current advisory before swimming.
Explore Clear Lake across LakeGrade
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Where this data comes from
3 measurements from 1 monitoring station, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX3 samples · 2022–2023
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes