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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 49.2 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 0.9 µg/L | A |
| Trophic State Index (TSI) | 25 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +2 m/yr | 3 |
Location
County Ranking
Ranked #5 of 18 lakes in Manitowoc County
Nearby Lakes in Manitowoc County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Waukesha County · Clarity: 14.6 ft
Waukesha County · Clarity: 13.8 ft
Walworth County · Clarity: 19 ft
Washington County · Clarity: 12 ft
Kenosha County · Clarity: 10.1 ft
Washington County · Clarity: 12.5 ft
Oligotrophic Lakes in Wisconsin
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