Lost Island Lake
Palo Alto County, WisconsinEutrophic
Lost Island Lake is a productive, nutrient-rich eutrophic lake in Palo Alto County, IA. Water quality is graded D based on 2 sampling years through 2024. Compared to the 2 other monitored lakes in Palo Alto County, Lost Island Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-11. 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 2.6 ft of visibility. Chlorophyll-a: 19.1 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.6 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 19.1 µg/L | C |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #1 of 3 lakes in Palo Alto County
Cleaner Lakes Within 30 Miles
Lost Island Lake holds Grade D. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Palo Alto 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: 2024-09-11
Monitoring stations: 1