Oneonta Lake
Oneonta Lake in Marinette County, Wisconsin has a water quality grade of B (Good). Water clarity: 7.5 ft visibility. Phosphorus: 16.7 µg/L. Maximum depth: 24 ft. Surface area: 68 acres.
- Clarity
- 7.5 ft
- Max depth
- 24 ft
- Area
- 68 acres
- Type
- Mesotrophic
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Marinette County
Oneonta Lake is a 68-acre mesotrophic lake in Marinette County, Wisconsin with a maximum depth of 24 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality 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 9 other monitored lakes in Marinette County, Oneonta Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-15. 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)
Moderate clarity, visible to about 7.5 ft. Phosphorus level: 16.7 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.5 ft | Not graded |
| Phosphorus | 16.7 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Oneonta Lake
Compare lakeside cabins, hotels, and vacation rentals near Oneonta Lake in Marinette 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 | 24 ft |
| Surface Area | 68 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Hilbert Lake - WestPublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Oneonta Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1999. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -2.25 m/yr | 2 |
| Phosphorus | ↓ Declining | +1.92 µg/L/yr | 3 |
EPA Impairment Status
Oneonta 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 WI10001760 · Official waterbody report
County Ranking
Ranked #9 of 10 lakes in Marinette County
Nearby Lakes in Marinette County
Frequently asked questions about Oneonta Lake
What is the water quality grade for Oneonta Lake?
- Oneonta Lake in Marinette County, Wisconsin has a water quality grade of B (Good). Water clarity: 7.5 ft visibility. Phosphorus: 16.7 µg/L. Maximum depth: 24 ft. Surface area: 68 acres.
Is Oneonta Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Oneonta Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Oneonta Lake?
- Oneonta Lake has a maximum depth of 24 feet. The lake covers 68 acres.
What fish are in Oneonta Lake?
- Fish species found in Oneonta Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. Oneonta Lake is located in Marinette County, Wisconsin.
Are there boat ramps on Oneonta Lake?
- Oneonta Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Hilbert Lake - West. Public access is listed as yes.
Explore Oneonta Lake across LakeGrade
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Moderate nutrients, good water quality
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Where this data comes from
18 measurements from 1 monitoring station, 2025–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX18 samples · 2025–2026
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
Impairment status from EPA ATTAINS 303(d) database
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