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F

Muewissen Lake

Carver County, MinnesotaHypereutrophic

On the LakeGrade rubric Muewissen Lake fails the cutoffs — a TSI of 73 and persistent algal pressure put it in the bottom tier. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

The hypereutrophic status — TSI 73 — reflects sustained heavy nutrient loading from the surrounding watershed and frequent algal pressure. 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. Muewissen Lake ranks 37 of 40 in Carver County — at the lower end of the locally monitored distribution.

Muewissen Lake has no invasive species recorded in Minnesota state databases as of 2024, though prevention practices still apply at all access points. The state fisheries records do not list documented species for Muewissen Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The lake lacks a documented public access point, so visitor use is limited. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-03. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Avoid swimming, very poor water quality, potential algae toxins

Water Quality Grade: F, Very Poor

Very murky, less than 1.6 ft of visibility. Phosphorus level: 149.5 µg/L. Trophic State Index: 73.

MetricValueGrade
Water Clarity (Secchi Depth)1.6 ftF
Phosphorus149.5 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)73Hypereutrophic

Very high nutrients, dense algae, poor clarity

Water Quality Trend: Improving

Based on 5 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.046 m/yr5
Phosphorus Improving-33.9 µg/L/yr5
See year-by-year chart →

Location

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County Ranking

Ranked #37 of 40 lakes in Carver County

Cleaner Lakes Within 30 Miles

Muewissen Lake holds Grade F. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Carver County

Hypereutrophic Lakes in Minnesota

EPA Impairment Status

Muewissen Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Nutrients (phosphorus, nitrogen)

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MN10-0069-00 · Official waterbody report · Matched by proximity (0.96 km)

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: 2024-10-03

Monitoring stations: 1