How Clean Is Birch Lake?
Birch Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Phosphorus: 60.3 µg/L. Trophic State Index: 63.
Cleanliness Snapshot
| Metric | Birch Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | C |
| Phosphorus | 60.3 µg/L | <30 = clean |
| Trophic State Index | 63 | <50 = clean |
How does Birch Lake compare?
Birch Lake's grade of D falls below the Wisconsin state average of C. It ranks #48 of 50 lakes in Sawyer County by water quality score. Multi-year monitoring data shows water quality is improving based on 2 years of records.