Is L. Ste. Louise Lake Safe for Swimming?
L. Ste. Louise Lake in St. Charles County, Wisconsin has a water quality grade of D (Poor). Swimming not recommended, poor water quality with high algae risk. Water clarity: 2.6 ft visibility. Phosphorus: 40.8 µg/L. Chlorophyll-a (algae): 18.3 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | D (Poor) |
| Water Clarity (Secchi Depth) | 2.6 ft |
| Phosphorus | 40.8 μg/L |
| Chlorophyll-a (Algae) | 18.3 μg/L |
| Location | St. Charles County, Wisconsin |
How does L. Ste. Louise Lake compare?
With an overall water quality grade of D, L. Ste. Louise Lake falls below the Wisconsin state average of Grade C. It ranks #2 of 11 lakes in St. Charles County by water quality score.
Water clarity (Secchi depth) sits at 2.6 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 18.3 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.