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F

Unnamed Lake

Hennepin County, MinnesotaLimited DataHypereutrophic

On the LakeGrade rubric Unnamed Lake fails the cutoffs — a TSI of 82 and persistent algal pressure put it in the bottom tier.

Hypereutrophic conditions mean the lake is operating at the upper end of the productivity scale, with all the bloom risk that implies. 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 Hennepin County's 95 graded lakes, Unnamed Lake ranks 63 — 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 lake lacks a documented public access point, so visitor use is limited. 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 2023-09-13. 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

No clarity data. Phosphorus level: 220.5 µg/L. Trophic State Index: 82.

MetricValueGrade
Water Clarity (Secchi Depth)No data
Phosphorus220.5 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)82Hypereutrophic

Very high nutrients, dense algae, poor clarity

Water Quality Trend: Stable

Based on 4 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.45 m/yr2
Phosphorus Improving-48.26 µg/L/yr4
See year-by-year chart →

Location

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County Ranking

Ranked #63 of 95 lakes in Hennepin County

Cleaner Lakes Within 30 Miles

Unnamed Lake holds Grade F. 5 nearby lakes hold higher grades.

Nearby Lakes in Hennepin County

Hypereutrophic Lakes in Minnesota

EPA Impairment Status

Unnamed Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Nutrients (phosphorus, nitrogen)

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

Source: EPA ATTAINS assessment unit MN27-0151-00 · Official waterbody report · Matched by proximity (0.9 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: 2023-09-13

Monitoring stations: 1