C
Spirit Lake -
St. Croix County, Wisconsin
Water Quality Grade: C — Fair
Moderate clarity — visible to about 9.8 feet. Phosphorus level: 88.1 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 m | C |
| Phosphorus | 88.1 µg/L | D |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #6 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: 2025-08-26
Monitoring stations: 1