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LakeQuality
D

Unnamed Lake

Crawford County, WisconsinEutrophic

Unnamed Lake pulls a D on the LakeGrade rubric — phosphorus loading and limited clarity hold it below the Wisconsin average. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.

A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. 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.

Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Murky, only visible to about 4.1 ft. Phosphorus level: 128 µg/L. Trophic State Index: 65.

MetricValueGrade
Water Clarity (Secchi Depth)4.1 ftD
Phosphorus128 µg/LF
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)65Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Surface Area3 acres

Water Quality Trend: Improving

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

MetricTrendChange/YearYears
Water Clarity Improving+0.12 m/yr2
See year-by-year chart →

Location

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County Ranking

Ranked #1 of 1 lakes in Crawford County

Cleaner Lakes Within 30 Miles

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

See full comparison →

Nearby Lakes in Crawford County

Eutrophic 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

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2022-09-13

Monitoring stations: 1