How Clean Is Black Oak Lake?
Black Oak 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): 28.5 ft. Phosphorus: 10.2 µg/L. Trophic State Index: 33.
Cleanliness Snapshot
| Metric | Black Oak Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 28.5 ft | — |
| Phosphorus | 10.2 µg/L | <30 = clean |
| Trophic State Index | 33 | <50 = clean |
How does Black Oak Lake compare?
Black Oak Lake's grade of A matches or beats the Wisconsin state average of C. It ranks #16 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.