Marion Lake vs Pelican Lake
Water quality, depth, fish species, and recreation comparison.
Pelican Lake has a higher water quality grade (A, Excellent) than Marion Lake (B, Good). Both are in Otter Tail County, Minnesota.
Marion Lake and Pelican 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 are within a letter of each other on the rubric — Marion Lake (B) versus Pelican Lake (A). The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
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.
Marion Lake
Good clarity, visible to about 11 ft.
Pelican Lake
Crystal clear, you can see 16.4 ft down.
Side-by-Side Metrics
| Metric | Marion Lake | Pelican Lake |
|---|---|---|
| Overall Grade | B (Good) | A (Excellent) |
| Water Clarity | 11 ft | 16.4 ft |
| Phosphorus | 18 µg/L | 15 µg/L |
| Chlorophyll-a (Algae) | 7.3 µg/L | 3 µg/L |
| Maximum Depth | 62 ft | 55 ft |
| Surface Area | 1,624 acres | 3,962 acres |
| Public Access | Yes | Yes |
| Fish Species | 17 | 20 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Pelican Lake wins on overall water quality with a Grade A versus Marion Lake's Grade B. Water clarity: 16.4 ft vs 11 ft. For fishing diversity, Pelican Lake also leads with 20 species.
Source: EPA National Aquatic Resource Surveys, 2026.