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B

Gerund Lake

Lake County, MinnesotaLimited DataMesotrophic

On the LakeGrade scale Gerund Lake grades a B, with clarity at 10.0 ft and phosphorus readings still being added placing it above the Minnesota median.

The lake sits in the mesotrophic zone — the band where most well-managed Minnesota lakes fall. At 85 ft of maximum depth, Gerund Lake stratifies reliably through the summer — the hypolimnion stays cooler and clearer than the surface layer suggests. At 90 acres, Gerund Lake sits below the Minnesota median: a small water where shoreline activity has an outsized effect on water quality. Gerund Lake ranks 65 of 142 in Lake County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Gerund Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Gerund Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Gerund Lake — most use is by shoreline residents and their guests. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-07-07. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 10 ft. Trophic State Index: 44.

MetricValueGrade
Water Clarity (Secchi Depth)10 ftB
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)44Mesotrophic

Moderate nutrients, good water quality

Lake Details

CharacteristicValue
Maximum Depth85 ft
Surface Area89.69 acres
Shoreline Length2.6 mi
Littoral Zone30%
Public AccessNo

Water Quality Trend: Declining

Based on 4 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.673 m/yr4
See year-by-year chart →

Location

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County Ranking

Ranked #65 of 142 lakes in Lake County

Nearby Lakes in Lake County

DNR Fisheries Survey Summary

1 survey on file from MN DNR Fisheries. Most recent: 1980-07-23 (Standard Survey).

Top Species by Catch Rate

SpeciesAvg CPUEAvg Weight
White Sucker2.001.17 lb
Northern Pike1.003.33 lb

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

From the 1980-07-23 survey

Composed of below average populations of northern pike and suckers.

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 Gerund Lake. 1 report on file.

EPA Impairment Status

Gerund Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN38-0372-00 · Official waterbody report · Matched by proximity (1.6 km)

Data Sources

Water quality data from the EPA Water Quality Portal

Impairment status from EPA ATTAINS 303(d) database

Grading methodology based on Metropolitan Council standards

Lake details from Minnesota DNR LakeFinder

Most recent sample: 2023-07-07

Monitoring stations: 4