How Clean Is Rainy Lake?
Rainy Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 4.9 ft. Trophic State Index: 54.
Cleanliness Snapshot
| Metric | Rainy Lake | Minnesota avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 4.9 ft | — |
| Trophic State Index | 54 | <50 = clean |
How does Rainy Lake compare?
Rainy Lake's grade of D falls below the Minnesota state average of C. It ranks #5 of 7 lakes in Koochiching County by water quality score.