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D

Unnamed Lake

Stearns County, MinnesotaLimited DataEutrophic

On the scoring rubric Unnamed Lake grades a D: clarity at 3.4 ft and phosphorus readings still being added keep it in the lower bracket for Stearns County.

Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. 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 Stearns County's 55 graded lakes, Unnamed Lake ranks 36 — below the local median, though not at the bottom.

No invasive species are currently listed at Unnamed Lake — the lake remains off the Minnesota infested-waters roster. The state fisheries records do not list documented species for Unnamed Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. 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 2022-09-12. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Murky, only visible to about 3.4 ft. Trophic State Index: 59.

MetricValueGrade
Water Clarity (Secchi Depth)3.4 ftD
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)59Eutrophic

High nutrients, frequent algae, reduced clarity

Location

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County Ranking

Ranked #36 of 55 lakes in Stearns County

Cleaner Lakes Within 30 Miles

Unnamed Lake holds Grade D. 3 nearby lakes hold higher grades.

Nearby Lakes in Stearns County

EPA Impairment Status

Unnamed Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Impaired biota (cause unknown)MercuryNutrients (phosphorus, nitrogen)

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

Source: EPA ATTAINS assessment unit MN47-0042-00 · Official waterbody report · Matched by proximity (2.58 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

Most recent sample: 2022-09-12

Monitoring stations: 2