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LakeQuality
C

Wolf Lake

Douglas County, MinnesotaEutrophic

Wolf Lake earns a C — middle-of-the-pack water quality, with one or two parameters dragging the average down from a stronger grade. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. A maximum depth of 42 ft puts Wolf Lake in the middle of Minnesota's depth distribution. At 307 acres, Wolf Lake fits the Minnesota median for monitored lakes, with 5.2 miles of shoreline. Within the 51 graded lakes of Douglas County, Wolf Lake sits at rank 42, near the bottom of the county list.

Wolf Lake is on the Minnesota infested-waters list for zebra mussels — boaters should follow clean-drain-dry protocols when moving gear to or from the lake. Walleye are documented at Wolf Lake, one of 12 fish species on record for the lake. Public access is available — the lake is on the Minnesota PCA 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, Minnesota DNR LakeFinder, last sampled 2022-07-12. Grade methodology: LakeGrade methodology.

Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Murky, only visible to about 3.6 ft. Phosphorus level: 44 µg/L. Trophic State Index: 59.

MetricValueGrade
Water Clarity (Secchi Depth)3.6 ftD
Phosphorus44 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)59Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth42 ft
Average Depth10 ft
Surface Area307.37 acres
Shoreline Length5.2 mi
Littoral Zone66%
Public AccessYes

Fish Species

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

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

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

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

Invasive Species

zebra mussel

Water Quality Trend: Declining

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.155 m/yr3

Location

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County Ranking

Ranked #42 of 51 lakes in Douglas County

Nearby Lakes in Douglas County

DNR Fisheries Survey Summary

12 surveys on file from MN DNR Fisheries. Most recent: 2022-07-11 (Targeted Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
Largemouth Bass33.540.92 lb
Bluegill20.300.16 lb
Bluntnose Minnow11.82
Green Sunfish10.030.24 lb
Black Crappie7.760.29 lb
BNS6.50

CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.

Length Distributions

Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.

Largemouth Bass

6 fish · 616 in · 2022-07-11
320678910111213141516

Bluegill

101 fish · 37 in · 2022-07-11
2312034567

Green Sunfish

1 fish · 55 in · 1999-08-23
105

Black Crappie

8 fish · 59 in · 2022-07-11
320trophy 1056789

From the 2022-07-11 survey

A trap net survey was conducted on Blackwell Lake on July 11-12, 2022 by Index of Biological Integrity (IBI) Program Staff. Nine trap nets were set along the shoreline in locations that encompassed multiple habitat types. Bluegill comprised a majority of the trap net catch by number. The number of Bluegill sampled per…

Source: MN DNR LakeFinder Fisheries Lake Survey

DNR Reports & Resources

Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Wolf Lake. 3 reports on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Most recent sample: 2022-07-12

Monitoring stations: 1