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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 20.5 ft | A |
| Phosphorus | 17.5 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 87 ft |
| Surface Area | 1.3K acres |
| Public Access | Yes |
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
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.232 m/yr | 7 |
| Phosphorus | ↑ Improving | -1.15 µg/L/yr | 6 |
Recreation & Access
Location
County Ranking
Ranked #4 of 38 lakes in Barron County
Nearby Lakes in Barron County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Waukesha County · Clarity: 14.6 ft
Waukesha County · Clarity: 13.8 ft
Walworth County · Clarity: 19 ft
Washington County · Clarity: 12 ft
Kenosha County · Clarity: 10.1 ft
Washington County · Clarity: 12.5 ft
Oligotrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1986. 5 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
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.
- 2022Bear Lake fisheries survey, 2022Fisheries Survey · WI DNR · 2022 (PDF)
- 2014Bear Lake comprehensive fisheries survey, 2014Comprehensive Survey · WI DNR · 2014 (PDF)
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