Big Pine Lake vs Marion Lake
Water quality, depth, fish species, and recreation comparison.
Marion Lake reads lower on nutrients and algae than Big Pine Lake. Both are in Otter Tail County, Minnesota.
Big Pine Lake and Marion 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: Big Pine Lake and Marion 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.
Big Pine Lake
Moderate clarity, visible to about 8.7 ft.
Marion Lake
Good clarity, visible to about 11 ft.
Side-by-Side Metrics
| Metric | Big Pine Lake | Marion Lake |
|---|---|---|
| Water Clarity | 8.7 ft | 11 ft Better |
| Phosphorus | 26 µg/L | 18 µg/L Better |
| Chlorophyll-a (Algae) | 8 µg/L | 7.3 µg/L Better |
| Maximum Depth | 76 ft Better | 62 ft |
| Surface Area | 4,728 acres | 1,624 acres |
| Public Access | Yes | Yes |
| Fish Species | 20 Better | 17 |
| 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.
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Verdict
Marion Lake reads lower on nutrients and algae than Big Pine Lake. Water clarity: 11 ft vs 8.7 ft. For more fish-species variety, Big Pine Lake edges ahead with 20 documented species.
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Where to stay near Big Pine Lake and Marion Lake
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Source: EPA National Aquatic Resource Surveys, 2026.