A
South Harper Lake -
St. Croix County, WisconsinLimited Data
Water Quality Grade: A — Excellent
Crystal clear — you can see 22.1 feet down.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.75 m | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #2 of 7 lakes in St. Croix County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-06-16
Monitoring stations: 1