Unn Pond
Dakota County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for Unn Pond. Here is what has been measured.
- Hypereutrophic
Unn Pond in Dakota County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 2 ft visibility. Phosphorus: 135 µg/L. Chlorophyll-a (algae): 51 µg/L.
Unn Pond is a highly nutrient-loaded hypereutrophic lake in Dakota County, Minnesota. Overall water quality is declining over recent sampling years. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 44 other monitored lakes in Dakota County, Unn Pond ranks #38 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-09-25. Methodology: how these readings are compared.
What Unn Pond is good for
From access and monitoring records, not editorial picks.
- Ice seasonIce-out around Apr 6
Swimming conditions
Readings onlyAlgae risk
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Unn Pond is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Unn Pond
These are the measurements Minnesota PCA publishes for Unn Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2 ft of visibility. Phosphorus 135 µg/L. Chlorophyll-a 51 µg/L. TSI 70.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 135µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 51µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 70 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Unn Pond
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Unn Pond typically sits around 68°F at the surface in September. Summer average is about 77°F. Usually warmest in Jul (about 78°F) and coldest in Sep (about 68°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (68°F) to its warmest (78°F).
Typical surface water temperature by month, from 30 field readings (2021–2024) via the EPA Water Quality Portal. See the full Unn Pond water temperature breakdown →
Stays via Stay22
Stays near Unn Pond
Compare lakeside cabins, hotels, and vacation rentals near Unn Pond in Dakota 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 readings cover nutrients and algae, not lodging. Cabins and rentals around Unn Pond are listed below.
Top-rated places to stay near Unn Pond
Prices for Oct 16–18, 4 adults. Change dates on the map below.
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
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Fishing Unn Pond
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Stable6 years
Phosphorus
Stable-0.86 µg/L/yr6 years
Chlorophyll-a
Worsening+2.84 µg/L/yr6 years
Ice season
Typical ice-out
Apr 6
Earliest Mar 30, 2003 · Latest Apr 17, 2008
Most recent ice-out
Apr 17
2008
6 observations · Minnesota PCA ice records
Nearby Lakes in Dakota County
Frequently asked questions about Unn Pond
Where is Unn Pond?
- Unn Pond is a lake in Dakota County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Unn Pond?
- Unn Pond in Dakota County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 2 ft visibility. Phosphorus: 135 µg/L. Chlorophyll-a (algae): 51 µg/L.
Is Unn Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Unn Pond?
- Unn Pond typically sits around 68°F at the surface in September, from 30 EPA Water Quality Portal field readings (2021–2024). That is a typical value for the month, not a live reading.
When does Unn Pond thaw?
- Unn Pond typically has ice-out around Apr 6.
Can I fish at Unn Pond?
- Public access to Unn Pond is listed as no on the lake record, so confirm before you make the trip. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
Explore Unn Pond across LakeQuality
Fish species and the cleanest lakes across Minnesota
Fish species and best lakes in Dakota County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its readings
Lakes in the Minnesota River Watershed, ranked by water quality
Minnesota's cleanest lakes, ranked on agency measurements
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State Parks Near Unn Pond
Other Lakes in Minnesota
Hypereutrophic Lakes in Minnesota
Where this data comes from
108 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA108 samples · 2021–2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity, Nephelometric Method
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Ice data from Minnesota DNR Climate