Is Mountain Lake Safe for Swimming?
Mountain Lake in Unknown County, Minnesota has a water quality grade of A (Excellent). Excellent for swimming, crystal clear water with minimal algae. Water clarity: 19 ft visibility. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | A (Excellent) |
| Water Clarity (Secchi Depth) | 19 ft |
| Maximum Depth | 130 ft |
| Location | Unknown County, Minnesota |
How does Mountain Lake compare?
With an overall water quality grade of A, Mountain Lake matches or beats the Minnesota state average of Grade C. It ranks #4 of 6 lakes in Unknown County by water quality score.
Water clarity (Secchi depth) sits at 19 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae.