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LakeQuality
A

Bear Lake

Barron County, WisconsinOligotrophic

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

Trophically, Bear Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. The lake's 87 ft maximum depth is in the upper tier for Wisconsin — deep enough for cold-water fish to find refuge in summer. With 1,348 acres of surface and partial shoreline records, Bear Lake is a large water by Wisconsin standards — recreational pressure is spread across a long shoreline. Within Barron County's 38 graded waters, Bear Lake sits at rank 4, near the top of the local distribution.

An invasive species record — Banded Mystery Snail — has been logged at Bear Lake; Wisconsin DNR maintains the official infested-waters list. The fishery includes walleye alongside the lake's other 5 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 2025-08-30. 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 20.5 ft down. Phosphorus level: 17.5 µg/L. Trophic State Index: 40.

MetricValueGrade
Water Clarity (Secchi Depth)20.5 ftA
Phosphorus17.5 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)40Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth87 ft
Surface Area1.3K acres
Public AccessYes

Fish Species

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

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

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

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

Invasive Species

Banded Mystery SnailChinese Mystery SnailCurly-Leaf PondweedPurple Loosestrife

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Declining-0.232 m/yr7
Phosphorus Improving-1.15 µg/L/yr6

Recreation & Access

4
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #4 of 38 lakes in Barron County

Nearby Lakes in Barron County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1986. 5 stations on file (most recent sample 2025).

DNR Assessment
Reported
Trophic State Index 54 (eutrophic) · 5-year average

Fish Species (DNR-rated)

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

DNR Reports & Resources

Wisconsin DNR Fisheries scientists publish multi-year survey reports for Bear Lake covering fish populations, stocking, water quality, and management. 2 reports on file.

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: 2025-08-30

Monitoring stations: 4