Big Pine Lake vs Marion Lake
Water quality, depth, fish species, and recreation comparison.
Marion Lake has a higher water quality grade (A, Excellent) than Big Pine Lake (B, Good). 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 grades are close: Big Pine Lake (B) and Marion Lake (A) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.
With grades 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 7 ft.
Marion Lake
Good clarity, visible to about 11 ft.
Side-by-Side Metrics
| Metric | Big Pine Lake | Marion Lake |
|---|---|---|
| Overall Grade | B (Good) | A (Excellent) |
| Water Clarity | 7 ft | 11 ft |
| Phosphorus | 27 µg/L | 18 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 76 ft | 62 ft |
| Surface Area | 4.7K acres | 1.6K acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | eutrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Marion Lake wins on overall water quality with a Grade A versus Big Pine Lake's Grade B. Water clarity: 11 ft vs 7 ft. For fishing diversity, Marion Lake also leads with 1 species.