How Clean Is Gunflint Lake?
Gunflint 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): 20 ft. Trophic State Index: 34.
Cleanliness Snapshot
| Metric | Gunflint Lake | Minnesota avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 20 ft | — |
| Trophic State Index | 34 | <50 = clean |
How does Gunflint Lake compare?
Gunflint Lake's grade of A matches or beats the Minnesota state average of C. It ranks #14 of 128 lakes in Cook County by water quality score. Multi-year monitoring data shows water quality is declining based on 4 years of records.