Big Lake vs Long Lake
Water quality, depth, fish species, and recreation comparison.
Long Lake reads lower on nutrients and algae than Big Lake. Both are in Beltrami County, Minnesota.
Big Lake and Long 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 their nutrient and algae readings, Big Lake versus Long 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.
Big Lake
Moderate clarity, visible to about 9.7 ft.
Long Lake
Crystal clear, you can see 20 ft down.
Side-by-Side Metrics
| Metric | Big Lake | Long Lake |
|---|---|---|
| Water Clarity | 9.7 ft | 20 ft Better |
| Phosphorus | 15 µg/L | 7 µg/L Better |
| Chlorophyll-a (Algae) | 4.8 µg/L | 1.8 µg/L Better |
| Maximum Depth | 35 ft | 87 ft Better |
| Surface Area | 3,598 acres | 412 acres |
| Public Access | Yes | No |
| Fish Species | 17 Better | 11 |
| Trophic State | mesotrophic | oligotrophic |
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.
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Verdict
Big Lake and Long Lake read the same on nutrients and algae overall. The tiebreakers come down to clarity (Big Lake: 9.7 ft, Long Lake: 20 ft) and what you want from the lake. Big Lake supports more documented fish species.
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Where to stay near Big Lake and Long Lake
Compare cabins, hotels, and vacation rentals around Big Lake and Long Lake. Both lakes are pinned on the map, so you can see which stays sit nearer the one you pick. Switch to Satellite to see how close each is to the water.
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Source: EPA National Aquatic Resource Surveys, 2026.