How Clean Is Big Portage (W Bay Lake?
Big Portage (W Bay Lake is among the cleanest lakes in Minnesota. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 8.5 ft. Phosphorus: 18.5 µg/L. Chlorophyll-a (algae): 5.6 µg/L. Trophic State Index: 47.
Cleanliness Snapshot
| Metric | Big Portage (W Bay Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 8.5 ft | — |
| Phosphorus | 18.5 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 5.6 µg/L | <10 = clean |
| Trophic State Index | 47 | <50 = clean |
How does Big Portage (W Bay Lake compare?
Big Portage (W Bay Lake's readings match or beat the Minnesota state average. It ranks #60 of 104 lakes in Cass County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.
Watch Big Portage (W Bay Lake water quality
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