Unnamed Lake
Unnamed Lake in Polk County, Wisconsin has a water quality grade of B (Good). Water clarity: 5 ft visibility. Phosphorus: 22.4 µg/L.
- Clarity
- 5 ft
- Type
- Eutrophic
- Trend
- ↓ Declining
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Unnamed Lake is a productive, nutrient-rich eutrophic lake in Polk County, Wisconsin. Water quality is graded B based on 1 sampling years through 2022. Overall water quality is declining over recent sampling years. Compared to the 54 other monitored lakes in Polk County, Unnamed Lake ranks #18 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2022-09-13. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Murky, only visible to about 5 ft. Phosphorus level: 22.4 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | Not graded |
| Phosphorus | 22.4 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Unnamed Lake
Compare lakeside cabins, hotels, and vacation rentals near Unnamed Lake in Polk County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Unnamed Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -5.25 m/yr | 2 |
| Phosphorus | ↓ Declining | +4.25 µg/L/yr | 2 |
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Unnamed Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Clear Lake Village OfClear Lake · 2.1 mi away · NPDES WI0023639Recent violation
- Arcand Poultry Farm IncBlack Brook, Town Of · 3.5 mi away · NPDES WI0059366
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #18 of 55 lakes in Polk County
Nearby Lakes in Polk County
Frequently asked questions about Unnamed Lake
Where is Unnamed Lake?
- Unnamed Lake is a lake in Polk County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Unnamed Lake?
- Unnamed Lake in Polk County, Wisconsin has a water quality grade of B (Good). Water clarity: 5 ft visibility. Phosphorus: 22.4 µg/L.
Is Unnamed Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Unnamed Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Explore Unnamed Lake across LakeQuality
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High nutrients, frequent algae, reduced clarity
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Other Grade B Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Where this data comes from
5 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX5 samples · 2022
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Fish and recreation data from Wisconsin DNR Lakes