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LakeQuality
F

Clear Lake

Stevens County, MinnesotaHypereutrophic

Clear Lake grades an F: water clarity, phosphorus, and chlorophyll-a all rate poorly, placing it among the most stressed lakes monitored in Minnesota. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

The hypereutrophic status — TSI 85 — reflects sustained heavy nutrient loading from the surrounding watershed and frequent algal pressure. 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. Among the 6 graded lakes in Stevens County, Clear Lake sits at rank 3, above the county median.

No invasive species are currently listed at Clear Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Clear Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. No formal public access is documented at Clear 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 2022-06-28. 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 0.7 ft of visibility. Phosphorus level: 288 µg/L. Trophic State Index: 85.

MetricValueGrade
Water Clarity (Secchi Depth)0.7 ftF
Phosphorus288 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)85Hypereutrophic

Very high nutrients, dense algae, poor clarity

Location

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County Ranking

Ranked #3 of 6 lakes in Stevens County

Nearby Lakes in Stevens County

Hypereutrophic Lakes in Minnesota

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2022-06-28

Monitoring stations: 1