How Clean Is Bear Island Lake?
Bear Island Lake is among the cleanest lakes in Minnesota. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 7 ft. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 6.4 µg/L. Trophic State Index: 47.
Cleanliness Snapshot
| Metric | Bear Island Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 7 ft | — |
| Phosphorus | 15 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 6.4 µg/L | <10 = clean |
| Trophic State Index | 47 | <50 = clean |
How does Bear Island Lake compare?
Bear Island Lake's readings match or beat the Minnesota state average. It ranks #18 of 68 lakes in St. Louis County on nutrient and algae readings. Multi-year monitoring data shows water quality is declining based on 5 years of records.
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