Unnamed Lake
Unnamed Lake in Polk County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.9 ft visibility. Phosphorus: 95 µg/L. Chlorophyll-a (algae): 8.5 µg/L. Maximum depth: 12 ft. Surface area: 50.65 acres.
- Clarity
- 6.9 ft
- Max depth
- 12 ft
- Area
- 51 acres
- Trend
- ↑ Improving
- Public access
- No
Next lake in Polk County
Why Unnamed Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Unnamed Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by MPCA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Unnamed Lake is a 51-acre lake in Polk County, Minnesota with a maximum depth of 12 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-08-08. Grade methodology: LakeGrade methodology.
Watch Unnamed Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Unnamed Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 6.9 ft. Phosphorus level: 95 µg/L. Chlorophyll-a: 8.5 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.9 ft | Not graded |
| Phosphorus | 95 µg/L | Not graded |
| Chlorophyll-a (Algae) | 8.5 µg/L | Not graded |
| Trophic State Index (TSI) | 57 | 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, Minnesota — 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.
Top-rated places to stay near Unnamed Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 12 ft |
| Surface Area | 51 acres |
| Shoreline Length | 1.4 mi |
| Littoral Zone | 100% |
| Public Access | No |
Fishing Unnamed Lake
DNR Fisheries Survey Summary
1 survey on file from MN DNR Fisheries. Most recent: 1984-08-29 (Standard Survey).
From the 1984-08-29 survey
NO FISH CAUGHT.
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Unnamed Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — MoeFisheries Lake Survey · MN DNR LakeFinder
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.515 m/yr | 2 |
| Phosphorus | ↑ Improving | -37.75 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -2.35 µg/L/yr | 2 |
Graded lakes near Unnamed Lake
Unnamed Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Polk County
Frequently asked questions about Unnamed Lake
What is the water quality grade for Unnamed Lake?
- Unnamed Lake in Polk County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.9 ft visibility. Phosphorus: 95 µg/L. Chlorophyll-a (algae): 8.5 µg/L. Maximum depth: 12 ft. Surface area: 50.65 acres.
Is Unnamed Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Unnamed Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Algae concentration (chlorophyll-a) is 8.5 µg/L. Always check local health department advisories before swimming.
How deep is Unnamed Lake?
- Unnamed Lake has a maximum depth of 12 feet. The lake covers 50.65 acres.
Explore Unnamed Lake across LakeGrade
Fish species and top-graded lakes across Minnesota
Fish species and best lakes in Polk County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its grade
Lakes in the St. Croix Watershed, ranked by water quality
Lakes in the Red River of the North Watershed, ranked by water quality
Minnesota's cleanest and most-polluted lakes, ranked
More Minnesota Lake Rankings
Other Lakes in Minnesota
Eutrophic Lakes in Minnesota
Where this data comes from
4 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA4 samples · 2023
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 2120 B ~ Color in Water by Visual Comparison
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
Lake details from Minnesota DNR LakeFinder