Is Chisago Lake Safe for Swimming?
Chisago Lake in Chisago County, Minnesota has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 4 ft visibility. Phosphorus: 32 µg/L. Chlorophyll-a (algae): 9.4 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 4 ft |
| Phosphorus | 32 μg/L |
| Chlorophyll-a (Algae) | 9.4 μg/L |
| Maximum Depth | 34 ft |
| Location | Chisago County, Minnesota |
How does Chisago Lake compare?
With an overall water quality grade of C, Chisago Lake matches or beats the Minnesota state average of Grade C. It ranks #18 of 31 lakes in Chisago 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 9.4 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.