How Clean Is Birch Lake?
Birch Lake is among the cleanest lakes in Minnesota. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 14 ft. Phosphorus: 12 µg/L. Chlorophyll-a (algae): 4 µg/L. Trophic State Index: 41.
Cleanliness Snapshot
| Metric | Birch Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 14 ft | — |
| Phosphorus | 12 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 4 µg/L | <10 = clean |
| Trophic State Index | 41 | <50 = clean |
How does Birch Lake compare?
Birch Lake's readings match or beat the Minnesota state average. It ranks #3 of 104 lakes in Cass County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.
Watch Birch Lake water quality
Get an email when the clarity or algae readings change. Unsubscribe anytime.