How Clean Is Birch Island Lake?
Birch Island Lake is among the cleanest lakes in Wisconsin. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 26.2 ft. Phosphorus: 13.7 µg/L. Trophic State Index: 36.
Cleanliness Snapshot
| Metric | Birch Island Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | B |
| Water Clarity (Secchi) | 26.2 ft | — |
| Phosphorus | 13.7 µg/L | <30 = clean |
| Trophic State Index | 36 | <50 = clean |
How does Birch Island Lake compare?
Birch Island Lake's grade of A matches or beats the Wisconsin state average of B. It ranks #4 of 70 lakes in Burnett County by water quality score. Multi-year monitoring data shows water quality is declining based on 7 years of records.