Is Cass Lake Allens Bay Safe for Swimming?
Cass Lake Allens Bay in Beltrami County, Minnesota has a water quality grade of A (Excellent). Excellent for swimming, crystal clear water with minimal algae. Water clarity: 16.6 ft visibility. Chlorophyll-a (algae): 4.7 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | A (Excellent) |
| Water Clarity (Secchi Depth) | 16.6 ft |
| Chlorophyll-a (Algae) | 4.7 μg/L |
| Maximum Depth | 120 ft |
| Location | Beltrami County, Minnesota |
How does Cass Lake Allens Bay compare?
With an overall water quality grade of A, Cass Lake Allens Bay matches or beats the Minnesota state average of Grade C. It ranks #17 of 92 lakes in Beltrami County by water quality score.
Water clarity (Secchi depth) sits at 16.6 feet. That counts as exceptional clarity — sunlight penetrates deep, supporting submerged plants and limiting algae. Algae levels (chlorophyll-a) measure 4.7 µg/L — low and well within safe swimming guidelines.