Unnamed Lake
Polk County, WisconsinLimited DataEutrophic
Unnamed Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Wisconsin average. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.
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. Unnamed Lake ranks 72 of 77 in Polk County — at the lower end of the locally monitored distribution.
Unnamed Lake has no invasive species recorded in Wisconsin state databases as of 2022, 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, Wisconsin DNR Surface Water, last sampled 2022-07-13. Grade methodology: LakeGrade methodology.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 5.4 ft. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.4 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.293 m/yr | 3 |
Location
County Ranking
Ranked #72 of 77 lakes in Polk County
Cleaner Lakes Within 30 Miles
Unnamed Lake holds Grade D. 5 nearby lakes hold higher grades.
- ACrescent LakePolk County · 3.5 mi · Two grade letters higher (D → A)
- AAntler LakePolk County · 3.8 mi · Two grade letters higher (D → A)
- ABone LakePolk County · 2.8 mi · Two grade letters higher (D → A)
- AWard LakePolk County · 3 mi · Two grade letters higher (D → A)
- BPogo LakePolk County · 1.5 mi · Two grade letters higher (D → B)
Nearby Lakes in Polk County
More Wisconsin Lake Rankings
State Parks Near Unnamed Lake
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Fish and recreation data from Wisconsin DNR Lakes
Most recent sample: 2022-07-13
Monitoring stations: 1