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C

Winkle Lake

St. Louis County, MinnesotaLimited DataEutrophic

Winkle Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year.

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. Winkle Lake sits at rank 132 of 187 in St. Louis County, in the lower half of the local distribution.

No invasive species are currently listed at Winkle Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Winkle 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 lake has a partial ice record — 5 observed ice-outs, centered near Apr 30. 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 2024-07-14. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

No clarity data. Phosphorus level: 32 µg/L. Trophic State Index: 54.

MetricValueGrade
Water Clarity (Secchi Depth)No data
Phosphorus32 µg/LC
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)54Eutrophic

High nutrients, frequent algae, reduced clarity

Water Quality Trend: Stable

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

MetricTrendChange/YearYears
Water Clarity Declining-0.359 m/yr5
Phosphorus Improving-3.01 µg/L/yr5
See year-by-year chart →

Ice Season

Historical ice data from Minnesota DNR (7 observations).

Typical Ice-Out
Apr 30
EarliestLatest
Ice-Out2019-04-20 (2019)2022-05-03 (2022)
Ice-In2022-11-16 (2022)2023-11-23 (2023)

Most recent ice-out: 2023-04-30

Location

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County Ranking

Ranked #132 of 187 lakes in St. Louis County

Cleaner Lakes Within 30 Miles

Winkle Lake holds Grade C. 2 nearby lakes hold higher grades.

Nearby Lakes in St. Louis County

Eutrophic Lakes in Minnesota

EPA Impairment Status

Winkle 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 MN69-0521-00 · Official waterbody report · Matched by proximity (0.81 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

Ice data from Minnesota DNR Climate

Most recent sample: 2024-07-14

Monitoring stations: 1