Manson Lake
Manson Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 12 ft visibility. Phosphorus: 10.8 µg/L. Maximum depth: 54 ft. Surface area: 236 acres.
Wisconsin DNR lists Musky as common on Manson Lake. DNR survey details →
- Clarity
- 12 ft
- Max depth
- 54 ft
- Area
- 236 acres
- Type
- Oligotrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Manson Lake is a 236-acre cold, clear oligotrophic lake in Oneida County, Wisconsin with a maximum depth of 54 feet. Water quality is graded B based on 1 sampling years through 2026. 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, Manson Lake ranks #21 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-21. 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)
Good clarity, visible to about 12 ft. Phosphorus level: 10.8 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | Not graded |
| Phosphorus | 10.8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Manson Lake
Compare lakeside cabins, hotels, and vacation rentals near Manson 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.
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Wisconsin DNR lists Musky as common on Manson Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Manson Lake 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 2000. 2 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 54 ft |
| Surface Area | 236 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Manson 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 Manson 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 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.517 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.33 µg/L/yr | 3 |
County Ranking
Ranked #21 of 67 lakes in Oneida County
Nearby Lakes in Oneida County
Frequently asked questions about Manson Lake
Where is Manson Lake?
- Manson 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 Manson Lake?
- Manson Lake in Oneida County, Wisconsin has a water quality grade of B (Good). Water clarity: 12 ft visibility. Phosphorus: 10.8 µg/L. Maximum depth: 54 ft. Surface area: 236 acres.
Is Manson Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Manson Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Manson Lake?
- Manson Lake has a maximum depth of 54 feet. The lake covers 236 acres.
What fish are in Manson Lake?
- Fish species found in Manson Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Manson Lake is located in Oneida County, Wisconsin.
What did the DNR fisheries survey find at Manson Lake?
- Wisconsin DNR lists Musky as common on Manson Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Manson Lake 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 Manson Lake?
- Manson Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Manson Lake. Public access is listed as yes.
Explore Manson Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
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Where this data comes from
21 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_WQX21 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