Muewissen Lake
Carver County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for Muewissen Lake. Here is what has been measured.
- Eutrophic
Muewissen Lake in Carver County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 1.8 ft visibility. Phosphorus: 98.5 µg/L. Chlorophyll-a (algae): 18.7 µg/L.
Muewissen Lake is a productive, nutrient-rich eutrophic lake in Carver County, Minnesota. 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 37 other monitored lakes in Carver County, Muewissen Lake ranks #16 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-10-07. Methodology: how these readings are compared.
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 Muewissen Lake 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 Muewissen Lake
These are the measurements Minnesota PCA publishes for Muewissen Lake, 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 1.8 ft of visibility. Phosphorus 98.5 µg/L. Chlorophyll-a 18.7 µg/L. TSI 66.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 98.5µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 18.7µg/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. | 66 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Muewissen Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Muewissen Lake typically sits around 59°F at the surface in October. Summer average is about 74°F. Usually warmest in Jul (about 75°F) and coldest in Feb (about 32°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (32°F) to its warmest (75°F).
Typical surface water temperature by month, from 86 field readings (2019–2025) via the EPA Water Quality Portal. See the full Muewissen Lake water temperature breakdown →
Stays via Stay22
Stays near Muewissen Lake
Compare lakeside cabins, hotels, and vacation rentals near Muewissen Lake in Carver 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 Muewissen Lake are listed below.
Top-rated places to stay near Muewissen Lake
Prices for Oct 9–11, 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 Muewissen Lake
Water Quality Trend: Improving
Based on 6 years of monitoring (2020–2025).
Water clarity
Improving6 years
Phosphorus
Improving-32.53 µg/L/yr6 years
Chlorophyll-a
Improving-18.68 µg/L/yr6 years
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Muewissen Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Cologne WwtpCologne · 0.2 mi away · NPDES MN0023108Recent violation
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.
Nearby Lakes in Carver County
Frequently asked questions about Muewissen Lake
Where is Muewissen Lake?
- Muewissen Lake is a lake in Carver County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Muewissen Lake?
- Muewissen Lake in Carver County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 1.8 ft visibility. Phosphorus: 98.5 µg/L. Chlorophyll-a (algae): 18.7 µg/L.
Is Muewissen Lake 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 Muewissen Lake?
- Muewissen Lake typically sits around 59°F at the surface in October, from 86 EPA Water Quality Portal field readings (2019–2025). That is a typical value for the month, not a live reading.
Can I fish at Muewissen Lake?
- Public access to Muewissen Lake 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 Muewissen Lake across LakeQuality
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Where this data comes from
129 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA129 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)