Bear Island Lake vs Big Lake
Water quality, depth, fish species, and recreation comparison.
Bear Island Lake and Big Lake read the same on nutrients and algae. Both are in St. Louis County, Minnesota.
Bear Island Lake and Big Lake are both in Minnesota — a same-state head-to-head where the comparison comes down to lake-specific differences in depth, watershed, and monitoring history rather than the broader state-level water-quality regime. These two sit close on the readings, Bear Island Lake versus Big Lake. The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
With readings this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.
Bear Island Lake
Moderate clarity, visible to about 7 ft.
Big Lake
Moderate clarity, visible to about 8.2 ft.
Side-by-Side Metrics
| Metric | Bear Island Lake | Big Lake |
|---|---|---|
| Water Clarity | 7 ft | 8.2 ft Better |
| Phosphorus | 15 µg/L | 14 µg/L Better |
| Chlorophyll-a (Algae) | 6.4 µg/L | 4.9 µg/L Better |
| Maximum Depth | 62 ft Better | 22 ft |
| Surface Area | 2,362 acres | 1,904 acres |
| Public Access | Yes | Yes |
| Fish Species | 13 Better | 8 |
| Trophic State | mesotrophic | mesotrophic |
A green ✓ marks the better value for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better). Surface area and trophic state carry no tick — a bigger lake is not a better lake.
Swap a lake
Compare Bear Island Lake or Big Lake against a different lake.
Verdict
Both lakes earn the same Grade A. The tiebreakers come down to clarity (Bear Island Lake: 7 ft, Big Lake: 8.2 ft) and what you want from the lake. Bear Island Lake supports more documented fish species.
Source: EPA National Aquatic Resource Surveys, 2026.