Is Ml-Garrison Lake Safe for Swimming?
Ml-Garrison Lake in Aitkin County, Minnesota has a water quality grade of B (Good). Good for swimming, clear water with low algae levels. Water clarity: 12.5 ft visibility. Phosphorus: 26 µg/L. Chlorophyll-a (algae): 5.4 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | B (Good) |
| Water Clarity (Secchi Depth) | 12.5 ft |
| Phosphorus | 26 μg/L |
| Chlorophyll-a (Algae) | 5.4 μg/L |
| Maximum Depth | 42 ft |
| Location | Aitkin County, Minnesota |
How does Ml-Garrison Lake compare?
With an overall water quality grade of B, Ml-Garrison Lake matches or beats the Minnesota state average of Grade C. It ranks #26 of 53 lakes in Aitkin County by water quality score.
Water clarity (Secchi depth) sits at 12.5 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae. Algae levels (chlorophyll-a) measure 5.4 µg/L — low and well within safe swimming guidelines.