How Clean Is Big Portage Lake?
Big Portage 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): 18.5 ft. Phosphorus: 11.7 µg/L. Trophic State Index: 37.
Cleanliness Snapshot
| Metric | Big Portage Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 18.5 ft | — |
| Phosphorus | 11.7 µg/L | <30 = clean |
| Trophic State Index | 37 | <50 = clean |
How does Big Portage Lake compare?
Big Portage Lake's grade of A matches or beats the Wisconsin state average of C. It ranks #11 of 191 lakes in Vilas County by water quality score. Multi-year monitoring data shows water quality is stable based on 6 years of records.