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LakeQuality
F

George Lake

Martin County, MinnesotaHypereutrophic

George Lake earns an F: 160 µg/L of phosphorus and clarity at 1.6 ft signal heavy nutrient loading from the surrounding watershed. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

The hypereutrophic status — TSI 74 — reflects sustained heavy nutrient loading from the surrounding watershed and frequent algal pressure. A maximum depth of just 11 ft means sediment-bound phosphorus releases back into the water column whenever wind stirs the bottom — a classic shallow-lake dynamic. George Lake is small — 83 acres alongside 2.6 miles of shoreline — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Among the 7 graded lakes in Martin County, George Lake sits at rank 2, above the county median.

No invasive species are currently listed at George Lake — the lake remains off the Minnesota infested-waters roster. Walleye are documented at George Lake, one of 15 fish species on record for the lake. A documented public access point at George Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The lake has a partial ice record — 13 observed ice-outs, centered near Mar 26. Multiple sampling years from Minnesota PCA volunteers and partner agencies back the grade, so the letter should hold steady absent a major watershed shift.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-23. Grade methodology: LakeGrade methodology.

Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 1.6 ft of visibility. Phosphorus level: 160 µg/L. Chlorophyll-a: 93.5 µg/L. Trophic State Index: 74.

MetricValueGrade
Water Clarity (Secchi Depth)1.6 ftF
Phosphorus160 µg/LF
Chlorophyll-a (Algae)93.5 µg/LF
Trophic State Index (TSI)74Hypereutrophic

Very high nutrients, dense algae, poor clarity

Lake Details

CharacteristicValue
Maximum Depth11 ft
Surface Area83.17 acres
Shoreline Length2.6 mi
Littoral Zone100%
Public AccessYes

Fish Species

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

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

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

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

Water Quality Trend: Improving

Based on 5 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.028 m/yr5
Phosphorus Improving-8.05 µg/L/yr5
Chlorophyll-a Improving-33.4 µg/L/yr2

Ice Season

Historical ice data from Minnesota DNR (20 observations).

Typical Ice-Out
Mar 26
Typical Ice-In
Nov 30

Estimated open water season: 249 days

EarliestLatest
Ice-Out2024-02-23 (2024)2018-04-29 (2018)
Ice-In2018-11-13 (2018)2017-12-08 (2017)

Most recent ice-out: 2026-03-10

Location

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County Ranking

Ranked #2 of 7 lakes in Martin County

Nearby Lakes in Martin County

Hypereutrophic Lakes in Minnesota

DNR Fisheries Survey Summary

9 surveys on file from MN DNR Fisheries. Most recent: 2025-07-28 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
YLB75.640.19 lb
Black Bullhead23.970.43 lb
Freshwater Drum16.690.62 lb
Yellow Perch12.010.21 lb
Black Crappie11.220.3 lb
Bluegill11.070.28 lb

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.

YLB

250 fish · 510 in · 2025-07-28
1567805678910

Black Bullhead

22 fish · 910 in · 2025-07-28
1890910

Freshwater Drum

159 fish · 816 in · 2025-07-28
392008910111213141516

Yellow Perch

36 fish · 68 in · 2025-07-28
27140678

From the 2025-07-28 survey

George Lake is an 84-acre, class 40 lake that has a maximum depth of 11.0 feet, and is located within the City of Fairmont in Martin County. George Lake is the farthest downstream on a chain of five lakes collectively known as the "Fairmont Chain of Lakes". George Lake is managed primarily for Walleye and Muskellunge…

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 George 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

Ice data from Minnesota DNR Climate

Most recent sample: 2024-10-23

Monitoring stations: 1