Is Lake 37 Safe for Swimming?
Lake 37 in St. Charles County, Wisconsin has a water quality grade of B (Good). Good for swimming, clear water with low algae levels. Water clarity: 4 ft visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 7.2 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | B (Good) |
| Water Clarity (Secchi Depth) | 4 ft |
| Phosphorus | 16 μg/L |
| Chlorophyll-a (Algae) | 7.2 μg/L |
| Location | St. Charles County, Wisconsin |
How does Lake 37 compare?
With an overall water quality grade of B, Lake 37 matches or beats the Wisconsin state average of Grade C. It ranks #1 of 11 lakes in St. Charles County by water quality score.
Water clarity (Secchi depth) sits at 4 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 7.2 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.