Unnamed Lake
Morrison County, MinnesotaLimited DataMesotrophic
Unnamed Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year.
Mesotrophic conditions dominate at Unnamed Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. 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. Unnamed Lake sits at rank 11 of 16 in Morrison County, in the lower half of the local distribution.
Unnamed Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. 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. 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 2024-09-11. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Moderate clarity, visible to about 6.9 ft. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.9 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.18 m/yr | 5 |
Location
County Ranking
Ranked #11 of 16 lakes in Morrison County
Cleaner Lakes Within 30 Miles
Unnamed Lake holds Grade C. 5 nearby lakes hold higher grades.
- ASylvan LakeCass County · mi · Two grade letters higher (C → A)
- APillager LakeCass County · mi · Two grade letters higher (C → A)
- AMiddle Whipple LakeCrow Wing County · mi · Two grade letters higher (C → A)
- AWhite Sand LakeCrow Wing County · mi · Two grade letters higher (C → A)
- BDade LakeCass County · mi · Higher grade (C → B)
Nearby Lakes in Morrison County
More Minnesota Lake Rankings
State Parks Near Unnamed Lake
Other Grade C Lakes in Minnesota
Mesotrophic Lakes in Minnesota
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-11
Monitoring stations: 1