Horsetail Lake
Cook County, WisconsinEutrophic
Horsetail Lake is a productive, nutrient-rich eutrophic lake in Cook County, IL. Water quality is graded D based on 2 sampling years through 2020. Compared to the 67 other monitored lakes in Cook County, Horsetail Lake ranks #40 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2020-10-26. Grade methodology: LakeGrade methodology.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 2.2 ft of visibility. Phosphorus level: 39 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.2 ft | F |
| Phosphorus | 39 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #40 of 68 lakes in Cook County
Nearby Lakes in Cook County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2020-10-26
Monitoring stations: 2