Unnamed Lake
Unnamed Lake in Scott County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 2.9 ft visibility. Phosphorus: 83.5 µg/L. Chlorophyll-a (algae): 12.4 µg/L.
- Clarity
- 2.9 ft
- Typical in August
- 73°F
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- No
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Unnamed Lake →
Next lake in Scott County
Unnamed Lake is a productive, nutrient-rich eutrophic lake in Scott County, Minnesota. Water quality is graded D based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 20 other monitored lakes in Scott County, Unnamed Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-06. Grade methodology: LakeGrade 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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 2.9 ft of visibility. Phosphorus level: 83.5 µg/L. Chlorophyll-a: 12.4 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.9 ft | Not graded |
| Phosphorus | 83.5 µg/L | Poor |
| Chlorophyll-a (Algae) | 12.4 µg/L | Fair |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Unnamed Lake
Compare lakeside cabins, hotels, and vacation rentals near Unnamed Lake in Scott 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Unnamed Lake are listed below.
Top-rated places to stay near Unnamed Lake
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
Unnamed Lake typically sits around 73°F at the surface in August. Summer average is about 73°F. Usually warmest in Jul (about 75°F) and coldest in Oct (about 56°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 16 field readings (2019–2024) via the EPA Water Quality Portal. See the full Unnamed Lake water temperature breakdown →
Fishing Unnamed Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -9 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -1.91 µg/L/yr | 5 |
EPA Impairment Status
Unnamed Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN70-0076-00 · Official waterbody report · Matched by proximity (2.37 km)
County Ranking
Ranked #9 of 21 lakes in Scott County
Nearby Lakes With Higher Grades
Unnamed Lake holds Grade D. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Scott County
Frequently asked questions about Unnamed Lake
What is the water quality grade for Unnamed Lake?
- Unnamed Lake in Scott County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 2.9 ft visibility. Phosphorus: 83.5 µg/L. Chlorophyll-a (algae): 12.4 µg/L.
Is Unnamed Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Unnamed Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 12.4 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Unnamed Lake?
- Unnamed Lake typically sits around 73°F at the surface in August, from 16 EPA Water Quality Portal field readings (2019–2024). That is a typical value for the month, not a live reading.
Explore Unnamed Lake across LakeGrade
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
32 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA32 samples · 2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- Analysis of Chlorophyll in Periphyton and Plankton
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
Impairment status from EPA ATTAINS 303(d) database