How Clean Is Birch Lake?
Birch Lake is a clean lake by Wisconsin standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 6.5 ft. Phosphorus: 16.6 µg/L. Trophic State Index: 47.
Cleanliness Snapshot
| Metric | Birch Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 6.5 ft | — |
| Phosphorus | 16.6 µg/L | <30 = clean |
| Trophic State Index | 47 | <50 = clean |
How does Birch Lake compare?
Birch Lake's grade of B matches or beats the Wisconsin state average of C. It ranks #127 of 191 lakes in Vilas County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.