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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.1 ft | D |
| Phosphorus | 128 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 3 acres |
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.12 m/yr | 2 |
Location
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.
- AGoodwiler LakeIowa County · 22.9 mi · Two grade letters higher (D → A)
- BJones Slough LakeGrant County · 17.9 mi · Two grade letters higher (D → B)
- BKendal LakeIowa County · 24.2 mi · Two grade letters higher (D → B)
- BRice LakeGrant County · 18.5 mi · Two grade letters higher (D → B)
- DUnknown LakeGrant County · 19.7 mi · Higher overall water quality score
Nearby Lakes in Crawford County
More Wisconsin Lake Rankings
State Parks Near Unnamed Lake
Other Grade D Lakes in Wisconsin
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