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LakeQuality
F

Gleason Lake

Hennepin County, MinnesotaLimited DataEutrophic

Gleason Lake grades an F: water clarity, phosphorus, and chlorophyll-a all rate poorly, placing it among the most stressed lakes monitored in Minnesota. 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. 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. No formal public access is documented at Gleason Lake — most use is by shoreline residents and their guests. 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 2024-07-21. 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 1.7 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

Nearby Lakes in Hennepin County

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2024-07-21

Monitoring stations: 1