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F

Turtle Lake East End

Cook County, MinnesotaLimited Data

On the LakeGrade rubric Turtle Lake East End fails the cutoffs — a TSI of — and persistent algal pressure put it in the bottom tier.

There is not yet enough seasonal data to settle the lake's trophic classification — the TSI window remains too narrow to call. 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 128 graded lakes of Cook County, Turtle Lake East End sits at rank 126, near the bottom of the county list.

Turtle Lake East End has no invasive species recorded in Minnesota state databases as of 2025, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Turtle Lake East End, which usually reflects a lack of formal fisheries survey work rather than an empty lake. 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 2025-09-29. 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 -324.8 ft of visibility.

MetricValueGrade
Water Clarity (Secchi Depth)-324.8 ftF
PhosphorusNo data
Chlorophyll-a (Algae)No data

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Declining-10.222 m/yr4
Phosphorus Improving-2.78 µg/L/yr4
Chlorophyll-a Stable-0.01 µg/L/yr4
See year-by-year chart →

Location

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County Ranking

Ranked #126 of 128 lakes in Cook County

Cleaner Lakes Within 30 Miles

Turtle Lake East End holds Grade F. 3 nearby lakes hold higher grades.

Nearby Lakes in Cook County

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-09-29

Monitoring stations: 1