How Clean Is Big Portage Lake?
Big Portage 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): 18.5 ft. Phosphorus: 12 µg/L. Trophic State Index: 38.
Cleanliness Snapshot
| Metric | Big Portage Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | B | B |
| Water Clarity (Secchi) | 18.5 ft | — |
| Phosphorus | 12 µg/L | <30 = clean |
| Trophic State Index | 38 | <50 = clean |
How does Big Portage Lake compare?
Big Portage Lake's grade of B matches or beats the Wisconsin state average of B. It ranks #33 of 103 lakes in Vilas County by water quality score. Multi-year monitoring data shows water quality is stable based on 7 years of records.