Lake Thompson
Lake Thompson in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 4 ft visibility. Phosphorus: 22.4 µg/L. Maximum depth: 30 ft. Surface area: 401 acres.
Wisconsin DNR rates Panfish as abundant on Lake Thompson. DNR survey details →
- Clarity
- 4 ft
- Max depth
- 30 ft
- Area
- 401 acres
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Lake Thompson is a 401-acre productive, nutrient-rich eutrophic lake in Oneida County, Wisconsin with a maximum depth of 30 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 with 1 public boat landing. Compared to the 66 other monitored lakes in Oneida County, Lake Thompson ranks #37 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-05. Grade methodology: LakeGrade 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)
Murky, only visible to about 4 ft. Phosphorus level: 22.4 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4 ft | Not graded |
| Phosphorus | 22.4 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Thompson
Compare lakeside cabins, hotels, and vacation rentals near Lake Thompson 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 Lake Thompson
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Wisconsin DNR rates Panfish as abundant on Lake Thompson.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Lake Thompson B from EPA Water Quality Portal chemistry, and the water-quality trend over 6 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. Monitored by volunteers since 1993. 2 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Lake Thompson covering fish populations, stocking, water quality, and management. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2025Thompson Lake spring summary report, 2025Fisheries Survey · WI DNR · 2025 (PDF)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 30 ft |
| Surface Area | 401 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Thompson LakePublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lake Thompson
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 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.111 m/yr | 5 |
| Phosphorus | → Stable | -0.17 µg/L/yr | 6 |
County Ranking
Ranked #37 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Lake Thompson
Where is Lake Thompson?
- Lake Thompson 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 Lake Thompson?
- Lake Thompson in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 4 ft visibility. Phosphorus: 22.4 µg/L. Maximum depth: 30 ft. Surface area: 401 acres.
Is Lake Thompson safe to swim in?
- Good for swimming, clear water with low algae levels. Lake Thompson has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Lake Thompson?
- Lake Thompson has a maximum depth of 30 feet. The lake covers 401 acres.
What fish are in Lake Thompson?
- Fish species found in Lake Thompson include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Lake Thompson is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Lake Thompson?
- Wisconsin DNR rates Panfish as abundant on Lake Thompson. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Lake Thompson B from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Lake Thompson?
- Lake Thompson has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Thompson Lake. Public access is listed as yes.
Explore Lake Thompson across LakeGrade
Depth, room, public access, and the state wake-sport rules
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Oneida County
Species activity outlook by water temperature and season
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Top lakes and where to stay in the Minocqua Chain area
Where to stay at Wisconsin's top lakes, each with its grade
Lakes in the Wisconsin River Watershed, ranked by water quality
High nutrients, frequent algae, reduced clarity
Wisconsin's cleanest and most-polluted lakes, ranked
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Where this data comes from
32 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX32 samples · 2020–2025
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (2)
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