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F

Unnamed Lake

Crawford County, WisconsinHypereutrophic

Unnamed Lake grades an F: water clarity, phosphorus, and chlorophyll-a all rate poorly, placing it among the most stressed lakes monitored in Wisconsin. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

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. Unnamed Lake is small — 3 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure.

Unnamed Lake has no invasive species recorded in Wisconsin state databases as of 2022, though prevention practices still apply at all access points. 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 2022-09-13. Grade methodology: LakeGrade methodology.

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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 1.2 ft of visibility. Phosphorus level: 128 µg/L. Trophic State Index: 74.

MetricValueGrade
Water Clarity (Secchi Depth)1.2 ftF
Phosphorus128 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)74Hypereutrophic

Very high nutrients, dense algae, poor clarity

Lake Details

CharacteristicValue
Surface Area3 acres
Public AccessYes

Water Quality Trend: Improving

Based on 2 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.12 m/yr2

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #1 of 1 lakes in Crawford County

Cleaner Lakes Within 30 Miles

Unnamed Lake holds Grade F. 5 nearby lakes hold higher grades.

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Nearby Lakes in Crawford County

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

Fish and recreation data from Wisconsin DNR Lakes

Public boat-access points from the USGS National Boat Ramps inventory

Most recent sample: 2022-09-13

Monitoring stations: 1

Where to stay near Unnamed Lake

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