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Cedar Lake

Manitowoc County, WisconsinMesotrophic

Cedar Lake earns an A — every scored parameter (clarity and phosphorus) rates among the best monitored waters in Manitowoc County. The two scored sub-grades — clarity and phosphorus — track close together, so neither one is dragging the average down.

The lake sits in the mesotrophic zone — the band where most well-managed Wisconsin lakes fall. 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. Cedar Lake ranks 2 of 18 in Manitowoc County, putting it in the upper tier of locally monitored lakes.

No invasive species are currently listed at Cedar Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Cedar 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 2025-08-11. Grade methodology: LakeGrade methodology.

Reviewed by LakeQuality Editorial Team · Updated

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Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Good clarity, visible to about 10.2 ft. Phosphorus level: 17.3 µg/L. Trophic State Index: 44.

MetricValueGrade
Water Clarity (Secchi Depth)10.2 ftB
Phosphorus17.3 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)44Mesotrophic

Moderate nutrients, good water quality

Water Quality Trend: Stable

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-0.221 m/yr6
Phosphorus Improving-1.15 µg/L/yr6
See year-by-year chart →

Location

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County Ranking

Ranked #2 of 18 lakes in Manitowoc County

Nearby Lakes in Manitowoc County

DNR Reports & Resources

Wisconsin DNR Fisheries scientists publish multi-year survey reports for Cedar Lake covering fish populations, stocking, water quality, and management. 2 reports on file.

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-08-11

Monitoring stations: 2