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.
Watch Unnamed Lake water quality
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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.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.2 ft | F |
| Phosphorus | 128 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 74 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 3 acres |
| Public Access | Yes |
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 |
Recreation & Access
Location
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.
- CGoodwiler LakeIowa County · mi · Two grade letters higher (F → C)
- CKendal LakeIowa County · mi · Two grade letters higher (F → C)
- CJones Slough LakeGrant County · mi · Two grade letters higher (F → C)
- DRice LakeGrant County · mi · Higher grade (F → D)
- DAvoca LakeIowa County · mi · Higher grade (F → D)
Nearby Lakes in Crawford County
More Wisconsin Lake Rankings
State Parks Near Unnamed Lake
Other Grade F Lakes in Wisconsin
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
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
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