How Clean Is Big Birch Lake?
Big Birch 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): 12.5 ft. Phosphorus: 25 µg/L. Trophic State Index: 46.
Cleanliness Snapshot
| Metric | Big Birch Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 12.5 ft | — |
| Phosphorus | 25 µg/L | <30 = clean |
| Trophic State Index | 46 | <50 = clean |
How does Big Birch Lake compare?
Big Birch Lake's grade of B matches or beats the Minnesota state average of C. It ranks #4 of 18 lakes in Todd County by water quality score. Multi-year monitoring data shows water quality is stable based on 6 years of records.