Is Roy Lake Safe for Swimming?
Roy Lake in Mahnomen County, Minnesota has a water quality grade of C (Fair). Generally safe for swimming, moderate water quality. Water clarity: 6 ft visibility. Phosphorus: 24 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 | 24 μg/L |
| Maximum Depth | 16 ft |
| Location | Mahnomen County, Minnesota |
How does Roy Lake compare?
With an overall water quality grade of C, Roy Lake matches or beats the Minnesota state average of Grade C. It ranks #10 of 16 lakes in Mahnomen 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.