Bemidji Lake vs Big Lake
Water quality, depth, fish species, and recreation comparison.
Bemidji Lake and Big Lake read the same on nutrients and algae. Both are in Beltrami County, Minnesota.
Bemidji 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. The readings are close: Bemidji Lake and Big Lake sit within a narrow band of each other on phosphorus, chlorophyll-a and clarity. The per-parameter table below shows where the small differences actually live.
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.
Bemidji Lake
Good clarity, visible to about 12.5 ft.
Big Lake
Moderate clarity, visible to about 9.7 ft.
Side-by-Side Metrics
| Metric | Bemidji Lake | Big Lake |
|---|---|---|
| Water Clarity | 12.5 ft Better | 9.7 ft |
| Phosphorus | 16.5 µg/L | 15 µg/L Better |
| Chlorophyll-a (Algae) | 4 µg/L Better | 4.8 µg/L |
| Maximum Depth | 76 ft Better | 35 ft |
| Surface Area | 6,596 acres | 3,598 acres |
| Public Access | Yes | Yes |
| Fish Species | 16 | 17 Better |
| 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 Bemidji Lake or Big Lake against a different lake.
Verdict
Both lakes earn the same Grade A. The tiebreakers come down to clarity (Bemidji Lake: 12.5 ft, Big Lake: 9.7 ft) and what you want from the lake. Bemidji Lake has fewer fish species than Big Lake.
Source: EPA National Aquatic Resource Surveys, 2026.