How Clean Is Rainy Lake?
Rainy Lake has fair water quality — typical of lakes with moderate nutrient enrichment. It received a water quality grade of C (Fair) based on EPA monitoring data. Water clarity (Secchi depth): 7.5 ft. Trophic State Index: 48.
Cleanliness Snapshot
| Metric | Rainy Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 7.5 ft | — |
| Trophic State Index | 48 | <50 = clean |
How does Rainy Lake compare?
Rainy Lake's grade of C matches or beats the Minnesota state average of C. It ranks #1 of 7 lakes in Koochiching County by water quality score.