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.
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 220.5 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 82 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Water Quality Trend: → Stable
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.45 m/yr | 2 |
| Phosphorus | ↑ Improving | -48.26 µg/L/yr | 4 |
Location
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.
- BPeter LakeHennepin County · mi · Two grade letters higher (F → B)
- DThomas LakeHennepin County · mi · Higher grade (F → D)
- DIndependence LakeHennepin County · mi · Higher grade (F → D)
- DWinterhalter LakeHennepin County · mi · Higher grade (F → D)
- DHalf Moon LakeHennepin County · mi · Higher grade (F → D)
Nearby Lakes in Hennepin County
More Minnesota Lake Rankings
State Parks Near Unnamed Lake
Other Grade F 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
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