Is Mill Lake Safe for Swimming?
Mill Lake in Douglas County, Minnesota has a water quality grade of B (Good). Good for swimming, clear water with low algae levels. Water clarity: 11 ft visibility. Phosphorus: 24 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | B (Good) |
| Water Clarity (Secchi Depth) | 11 ft |
| Phosphorus | 24 μg/L |
| Maximum Depth | 40 ft |
| Location | Douglas County, Minnesota |
How does Mill Lake compare?
With an overall water quality grade of B, Mill Lake matches or beats the Minnesota state average of Grade C. It ranks #27 of 51 lakes in Douglas County by water quality score.
Water clarity (Secchi depth) sits at 11 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.