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Unnamed Lake

Portage County, WisconsinLimited DataOligotrophic

On the LakeGrade rubric, Unnamed Lake pulls an A: clarity readings still being added and 7 µg/L of phosphorus put it in the top bracket for Wisconsin.

Trophically, Unnamed 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. Unnamed Lake ranks 3 of 28 in Portage County, putting it in the upper tier of locally monitored lakes.

No invasive species are currently listed at Unnamed Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Unnamed 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 2025-05-07. 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

No clarity data. Phosphorus level: 6.5 µg/L. Trophic State Index: 31.

MetricValueGrade
Water Clarity (Secchi Depth)No data
Phosphorus6.5 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)31Oligotrophic

Low nutrients, clear water, excellent for swimming

Location

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County Ranking

Ranked #3 of 28 lakes in Portage County

Nearby Lakes in Portage County

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2025-05-07

Monitoring stations: 1