Unnamed Lake
Sherburne County, MinnesotaEutrophic
The LakeGrade rubric puts Unnamed Lake at a C: clarity at 5.2 ft, 34 µg/L of phosphorus, and a TSI of 54 signal an intermediate trophic state. With clarity and phosphorus scored, the sub-grades cluster within a letter of each other, pointing to stable conditions rather than one specific stressor.
At a TSI of 54, Unnamed Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. 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 Sherburne County's 24 graded lakes, Unnamed Lake ranks 15 — 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 2022-06-23. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 5.2 ft. Phosphorus level: 34 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.2 ft | D |
| Phosphorus | 34 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #15 of 24 lakes in Sherburne County
Cleaner Lakes Within 30 Miles
Unnamed Lake holds Grade C. 5 nearby lakes hold higher grades.
- AEast Hunter LakeSherburne County · mi · Two grade letters higher (C → A)
- ASandy LakeSherburne County · mi · Two grade letters higher (C → A)
- AAnn LakeSherburne County · mi · Two grade letters higher (C → A)
- BWest Hunter LakeSherburne County · mi · Higher grade (C → B)
- CBlue LakeIsanti County · mi · Higher overall water quality score
Nearby Lakes in Sherburne County
More Minnesota Lake Rankings
State Parks Near Unnamed Lake
Other Grade C Lakes in Minnesota
Eutrophic Lakes in Minnesota
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-06-23
Monitoring stations: 2