Wassermann Lake
Carver County, MinnesotaEutrophic
Wassermann Lake earns a D — measurements through 2024 show persistent nutrient pressure that limits clarity through the summer. clarity and phosphorus rate similarly, so there is no obvious single lever to pull on watershed management.
At a TSI of 63, Wassermann Lake reads as eutrophic — nutrient-rich enough that summer algal growth and reduced clarity are expected, not unusual. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake's surface area is not consistently recorded across state datasets — physical context remains partial. Wassermann Lake sits at rank 24 of 40 in Carver County, in the lower half of the local distribution.
Eurasian watermilfoil is established at Wassermann Lake, which can dampen recreational access and pressure the native plant community. The state fisheries records do not list documented species for Wassermann Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. A documented public access point at Wassermann Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-09. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 3 ft of visibility. Phosphorus level: 68 µg/L. Trophic State Index: 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | F |
| Phosphorus | 68 µg/L | D |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.068 m/yr | 5 |
| Phosphorus | ↑ Improving | -4.8 µg/L/yr | 5 |
Location
County Ranking
Ranked #24 of 40 lakes in Carver County
Cleaner Lakes Within 30 Miles
Wassermann Lake holds Grade D. 5 nearby lakes hold higher grades.
- APiersons LakeCarver County · mi · Two grade letters higher (D → A)
- CAuburn LakeCarver County · mi · Higher grade (D → C)
- CEast Auburn LakeCarver County · mi · Higher grade (D → C)
- CBavaria LakeCarver County · mi · Higher grade (D → C)
- CSteiger LakeCarver County · mi · Higher grade (D → C)
Nearby Lakes in Carver County
More Minnesota Lake Rankings
State Parks Near Wassermann Lake
Other Grade D Lakes in Minnesota
Eutrophic Lakes in Minnesota
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Wassermann Lake. 1 report on file.
- —Public Water Access Sites — Wassermann (Main)Public Water Access Sites · MN DNR LakeFinder
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
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-10-09
Monitoring stations: 1