Is Koronis Lake Safe for Swimming?
Koronis Lake in Stearns County, Minnesota has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 6 ft visibility. Phosphorus: 27 µg/L. Chlorophyll-a (algae): 13.8 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | C (Fair) |
| Water Clarity (Secchi Depth) | 6 ft |
| Phosphorus | 27 μg/L |
| Chlorophyll-a (Algae) | 13.8 μg/L |
| Maximum Depth | 132 ft |
| Location | Stearns County, Minnesota |
How does Koronis Lake compare?
With an overall water quality grade of C, Koronis Lake matches or beats the Minnesota state average of Grade C. It ranks #11 of 32 lakes in Stearns County by water quality score.
Water clarity (Secchi depth) sits at 6 feet. That puts the lake in good clarity range, with limited algae interference. Algae levels (chlorophyll-a) measure 13.8 µg/L — moderate; acceptable for swimming on most days, but worth checking advisories.
Watch Koronis Lake water quality
Get an email when the grade, clarity, or algae reading changes. Unsubscribe anytime.