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.
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 85 ft |
| Surface Area | 89.69 acres |
| Shoreline Length | 2.6 mi |
| Littoral Zone | 30% |
| Public Access | No |
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.673 m/yr | 4 |
Location
County Ranking
Ranked #65 of 142 lakes in Lake County
Nearby Lakes in Lake County
More Minnesota Lake Rankings
Other Grade B Lakes in Minnesota
Mesotrophic Lakes in Minnesota
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 1980-07-23 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| White Sucker | 2.00 | 1.17 lb |
| Northern Pike | 1.00 | 3.33 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.
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Gerund Lake. 1 report on file.
- —Fisheries Lake Survey — GerundFisheries Lake Survey · MN DNR LakeFinder
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
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