How Clean Is Big Lake?
Big Lake is a clean lake by Minnesota standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 9.5 ft. Phosphorus: 15 µg/L. Trophic State Index: 44.
Cleanliness Snapshot
| Metric | Big Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 9.5 ft | — |
| Phosphorus | 15 µg/L | <30 = clean |
| Trophic State Index | 44 | <50 = clean |
How does Big Lake compare?
Big Lake's grade of B matches or beats the Minnesota state average of C. It ranks #50 of 86 lakes in Beltrami County by water quality score. Multi-year monitoring data shows water quality is stable based on 5 years of records.