Wassermann Lake
Wassermann Lake in Carver County, Minnesota has a water quality grade of F (Algae-prone). Water clarity: 2.3 ft visibility. Phosphorus: 76 µg/L. Chlorophyll-a (algae): 48.1 µg/L.
- Clarity
- 2.3 ft
- Typical in August
- 66°F
- Type
- Eutrophic
- Trend
- ↓ Declining
- Public access
- Yes
Grade F measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Wassermann Lake →
Next lake in Carver County
Wassermann Lake is a productive, nutrient-rich eutrophic lake in Carver County, Minnesota. Water quality is graded F based on 2 sampling years through 2021. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 37 other monitored lakes in Carver County, Wassermann Lake ranks #23 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2021-09-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyAlgae risk
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.
Algae and nutrients are often high — check current advisories before swimming. Skip the water if you see scum or a paint-like bloom
Water Quality Grade: F (Algae-prone)
Very murky, less than 2.3 ft of visibility. Phosphorus level: 76 µg/L. Chlorophyll-a: 48.1 µg/L. Trophic State Index: 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.3 ft | Not graded |
| Phosphorus | 76 µg/L | Poor |
| Chlorophyll-a (Algae) | 48.1 µg/L | Poor |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Wassermann Lake
Compare lakeside cabins, hotels, and vacation rentals near Wassermann 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 grade measures nutrients and algae, not lodging — cabins and rentals around Wassermann Lake are listed below.
Top-rated places to stay near Wassermann Lake
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
Wassermann Lake typically sits around 66°F at the surface in August. Summer average is about 64°F. Usually warmest in Aug (about 66°F) and coldest in Nov (about 45°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 1,228 field readings (2010–2025) via the EPA Water Quality Portal. See the full Wassermann Lake water temperature breakdown →
Recreation & Access
- Wasserman LakePublic
Fishing Wassermann Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Wassermann Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Public Water Access Sites — Wassermann (Main)Public Water Access Sites · MN DNR LakeFinder
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.003 m/yr | 6 |
| Phosphorus | → Stable | -0.37 µg/L/yr | 6 |
| Chlorophyll-a | ↓ Declining | +1.48 µg/L/yr | 6 |
EPA Impairment Status
Wassermann Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN10-0048-00 · Official waterbody report
County Ranking
Ranked #23 of 38 lakes in Carver County
Nearby Lakes With Higher Grades
Wassermann Lake holds Grade F. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Carver County
Frequently asked questions about Wassermann Lake
What is the water quality grade for Wassermann Lake?
- Wassermann Lake in Carver County, Minnesota has a water quality grade of F (Algae-prone). Water clarity: 2.3 ft visibility. Phosphorus: 76 µg/L. Chlorophyll-a (algae): 48.1 µg/L.
Is Wassermann Lake safe to swim in?
- Algae and nutrients are often high — check current advisories before swimming. Skip the water if you see scum or a paint-like bloom. Wassermann Lake has a water quality grade of F (Algae-prone). Algae concentration (chlorophyll-a) is 48.1 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Wassermann Lake?
- Wassermann Lake typically sits around 66°F at the surface in August, from 1,228 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Are there boat ramps on Wassermann Lake?
- Wassermann Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Wasserman Lake. Public access is listed as yes.
Explore Wassermann Lake across LakeGrade
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Where this data comes from
165 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA165 samples · 2020–2021
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory