Oneida Lake
Oneida Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 5.5 ft visibility. Phosphorus: 23.1 µg/L. Maximum depth: 34 ft. Surface area: 255 acres.
- Clarity
- 5.5 ft
- Max depth
- 34 ft
- Area
- 255 acres
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Oneida County
Oneida Lake is a 255-acre productive, nutrient-rich eutrophic lake in Oneida County, Wisconsin with a maximum depth of 34 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 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available. Compared to the 66 other monitored lakes in Oneida County, Oneida Lake ranks #43 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-10-04. 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)
Murky, only visible to about 5.5 ft. Phosphorus level: 23.1 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.5 ft | Not graded |
| Phosphorus | 23.1 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Oneida Lake
Compare lakeside cabins, hotels, and vacation rentals near Oneida 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 Oneida Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 34 ft |
| Surface Area | 255 acres |
| Public Access | Yes |
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 Oneida 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. 1 station 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 | +0.086 m/yr | 6 |
| Phosphorus | ↑ Improving | -1.83 µg/L/yr | 6 |
EPA Impairment Status
Oneida 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 WI10007295 · Official waterbody report · Matched by proximity (1.48 km)
County Ranking
Ranked #43 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Oneida Lake
What is the water quality grade for Oneida Lake?
- Oneida Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 5.5 ft visibility. Phosphorus: 23.1 µg/L. Maximum depth: 34 ft. Surface area: 255 acres.
Is Oneida Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Oneida Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Oneida Lake?
- Oneida Lake has a maximum depth of 34 feet. The lake covers 255 acres.
What fish are in Oneida Lake?
- Fish species found in Oneida Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Oneida Lake is located in Oneida County, Wisconsin.
Explore Oneida Lake across LakeGrade
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High nutrients, frequent algae, reduced clarity
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More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Where this data comes from
18 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_WQX18 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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes