How Clean Is Big Birch Lake?
Big Birch Lake has fair water quality — typical of lakes with moderate nutrient enrichment. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 12.5 ft. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 4.4 µg/L. Trophic State Index: 45.
Cleanliness Snapshot
| Metric | Big Birch Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 12.5 ft | — |
| Phosphorus | 25 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 4.4 µg/L | <10 = clean |
| Trophic State Index | 45 | <50 = clean |
How does Big Birch Lake compare?
Big Birch Lake's readings match or beat the Minnesota state average. It ranks #2 of 8 lakes in Todd County on nutrient and algae readings. Multi-year monitoring data shows water quality is stable based on 6 years of records.
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