Manson Lake
Oneida County, Wisconsin236 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Manson Lake. Here is what has been measured.
- Oligotrophic
- 2 aquatic invasives
- 54 ft max depth
- Public access
Manson Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. 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 →
Manson Lake is a 236-acre cold, clear oligotrophic lake in Oneida County, Wisconsin with a maximum depth of 54 feet. 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. Methodology: how these readings are compared.
What Manson Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12 ft of visibility
- Boat launch1 documented ramp
- Fishing6 species recorded
- Deep water54 ft surveyed max depth
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Manson Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Manson Lake
These are the measurements Wisconsin DNR publishes for Manson Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 12 ft. Phosphorus 10.8 µg/L. TSI 40.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 12ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10.8µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 40 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Manson Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Musky as common on Manson Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Manson Lake’s water-quality measurements separately, 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
Max depth
54 ft
Surface area
236 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
5 sq mi
HydroLAKES / HydroSHEDS
Shoreline
3 mi
HydroLAKES / HydroSHEDS
Elevation
1,519 ft
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
Stays via Stay22
Stays near Manson Lake
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Top-rated places to stay near Manson Lake
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Follow Manson Lake’s readings
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Fish Species
Click a species to see every 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 (2020–2026).
Water clarity
Improving5 years
Phosphorus
Improving-0.33 µg/L/yr3 years
Nearby Lakes in Oneida County
Frequently asked questions about Manson Lake
Where is Manson Lake?
- Manson Lake is a lake in Oneida County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Manson Lake?
- Manson Lake in Oneida County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. 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?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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 water quality. LakeQuality shows Manson Lake’s water-quality measurements separately, 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.
Can I fish at Manson Lake?
- Manson Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
Explore Manson Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
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Species activity outlook by water temperature and season
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from 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