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LakeQuality
A

Bearskin Lake

Oneida County, WisconsinMesotrophic

Bearskin Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Oneida County. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. The lake bottoms out at 26 ft — a moderate depth that supports a warm-water fishery without the year-round cold refuge a deeper basin provides. At 403 acres, Bearskin Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Bearskin Lake sits at rank 92 of 140 in Oneida County, in the lower half of the local distribution.

Bearskin Lake has at least one documented invasive species (Chinese Mystery Snail), so boaters and anglers should observe clean-drain-dry steps when leaving the lake. The fishery includes walleye alongside the lake's other 6 documented species — a notable draw for Wisconsin anglers. Public access is available — the lake is on the Wisconsin DNR public-access list. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-10-08. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 19.7 ft down. Phosphorus level: 24.2 µg/L. Trophic State Index: 42.

MetricValueGrade
Water Clarity (Secchi Depth)19.7 ftA
Phosphorus24.2 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)42Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth26 ft
Surface Area403 acres
Public AccessYes

Fish Species

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for Bearskin Lake (14-day solunar calendar)

→ Is it safe to eat fish from Bearskin Lake? (mercury & PFAS guide)

Bearskin Lake fishing regulations (limits, seasons, special rules)

Invasive Species

Chinese Mystery SnailRusty Crayfish

Water Quality Trend: Stable

Based on 7 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.311 m/yr7
Phosphorus Improving-0.78 µg/L/yr6
See year-by-year chart →

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #92 of 140 lakes in Oneida County

Nearby Lakes in Oneida County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1990. 1 station on file (most recent sample 2025).

DNR Assessment
Good · Shallow Lowland lake
Trophic State Index 61 (eutrophic) · 5-year average

Fish Species (DNR-rated)

Musky(Common)Walleye(Common)Panfish(Present)Largemouth Bass(Present)Smallmouth Bass(Present)Northern Pike(Present)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2025-10-08

Monitoring stations: 1