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LakeQuality
A

Mi32 Lake

Manitowoc County, WisconsinOligotrophic

Mi32 Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Manitowoc County. Sub-grades cluster within a single letter of each other, which usually means the lake is in stable trophic balance rather than fighting one specific stressor.

Trophically, Mi32 Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. 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. Mi32 Lake ranks 5 of 18 in Manitowoc County — solidly in the upper half of the local distribution.

No invasive species are currently listed at Mi32 Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Mi32 Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. 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, Wisconsin DNR Surface Water, last sampled 2023-08-03. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 49.2 ft down. Chlorophyll-a: 0.9 µg/L. Trophic State Index: 25.

MetricValueGrade
Water Clarity (Secchi Depth)49.2 ftA
PhosphorusNo data
Chlorophyll-a (Algae)0.9 µg/LA
Trophic State Index (TSI)25Oligotrophic

Low nutrients, clear water, excellent for swimming

Water Quality Trend: Improving

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+2 m/yr3

Location

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County Ranking

Ranked #5 of 18 lakes in Manitowoc County

Nearby Lakes in Manitowoc County

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2023-08-03

Monitoring stations: 1