How Clean Is Cass Lake?
Cass Lake is among the cleanest lakes in Minnesota. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 18.5 ft. Chlorophyll-a (algae): 3.2 µg/L. Trophic State Index: 39.
Cleanliness Snapshot
| Metric | Cass Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 18.5 ft | — |
| Chlorophyll-a (Algae) | 3.2 µg/L | <10 = clean |
| Trophic State Index | 39 | <50 = clean |
How does Cass Lake compare?
Cass Lake's grade of A matches or beats the Minnesota state average of C. It ranks #18 of 92 lakes in Beltrami County by water quality score.