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F

Unnamed Lake

Clark County, WisconsinLimited DataHypereutrophic

On the LakeGrade rubric Unnamed Lake fails the cutoffs — a TSI of 73 and persistent algal pressure put it in the bottom tier.

Hypereutrophic conditions mean the lake is operating at the upper end of the productivity scale, with all the bloom risk that implies. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. The lake is compact at 7 acres, with partial shoreline records and little volume to buffer nutrient inputs. Among the 4 graded lakes in Clark County, Unnamed Lake ranks 1 — in the top quartile locally.

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 2022-07-19. 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 1.3 ft of visibility. Trophic State Index: 73.

MetricValueGrade
Water Clarity (Secchi Depth)1.3 ftF
PhosphorusNo data
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)73Hypereutrophic

Very high nutrients, dense algae, poor clarity

Lake Details

CharacteristicValue
Surface Area7 acres

Location

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County Ranking

Ranked #1 of 4 lakes in Clark County

Cleaner Lakes Within 30 Miles

Unnamed Lake holds Grade F. 2 nearby lakes hold higher grades.

Nearby Lakes in Clark County

Hypereutrophic Lakes in Wisconsin

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2022).

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2022-07-19

Monitoring stations: 1