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): 6.9 ft. Phosphorus: 26 µg/L. Trophic State Index: 50.
Cleanliness Snapshot
| Metric | Big Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 6.9 ft | — |
| Phosphorus | 26 µg/L | <30 = clean |
| Trophic State Index | 50 | <50 = clean |
How does Big Lake compare?
Big Lake's grade of B matches or beats the Minnesota state average of C. It ranks #22 of 55 lakes in Stearns County by water quality score. Multi-year monitoring data shows water quality is declining based on 5 years of records.