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F

Gleason Lake

Hennepin County, MinnesotaLimited DataEutrophic

Gleason Lake grades an F: every scored parameter (clarity) rates poorly, placing it among the most stressed lakes monitored in Minnesota.

At a TSI of 69, Gleason Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Within the 95 graded lakes of Hennepin County, Gleason Lake sits at rank 94, near the bottom of the county list.

No invasive species are currently listed at Gleason Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Gleason Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. 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 2024-07-21. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 1.7 ft of visibility. Trophic State Index: 69.

MetricValueGrade
Water Clarity (Secchi Depth)1.7 ftF
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)69Eutrophic

High nutrients, frequent algae, reduced clarity

Water Quality Trend: Declining

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

MetricTrendChange/YearYears
Water Clarity Declining-0.502 m/yr3

Location

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County Ranking

Ranked #94 of 95 lakes in Hennepin County

Cleaner Lakes Within 30 Miles

Gleason Lake holds Grade F. 3 nearby lakes hold higher grades.

Nearby Lakes in Hennepin County

EPA Impairment Status

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

Causes of impairment

Nutrients (phosphorus, nitrogen)

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

Source: EPA ATTAINS assessment unit MN27-0095-00 · Official waterbody report

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

Most recent sample: 2024-07-21

Monitoring stations: 1