Dead Lake vs Marion Lake
Water quality, depth, fish species, and recreation comparison.
Dead Lake reads lower on nutrients and algae than Marion Lake. Both are in Otter Tail County, Minnesota.
Both Dead Lake and Marion Lake sit in Minnesota. A same-state comparison strips out the state-level water-quality regime as a variable: any differences in the readings here are about the lakes themselves, not the agencies sampling them. The readings are close: Dead 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.
Dead Lake
Good clarity, visible to about 10.2 ft.
Marion Lake
Good clarity, visible to about 11 ft.
Side-by-Side Metrics
| Metric | Dead Lake | Marion Lake |
|---|---|---|
| Water Clarity | 10.2 ft | 11 ft Better |
| Phosphorus | 20 µg/L | 18 µg/L Better |
| Chlorophyll-a (Algae) | 5.8 µg/L Better | 7.3 µg/L |
| Maximum Depth | 65 ft Better | 62 ft |
| Surface Area | 7,546 acres | 1,624 acres |
| Public Access | Yes | Yes |
| Fish Species | 18 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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Compare Dead Lake or Marion Lake against a different lake.
Verdict
Dead Lake reads lower on nutrients and algae than Marion Lake. Water clarity: 10.2 ft vs 11 ft. For fishing diversity, Dead Lake also leads with 18 species.
Source: EPA National Aquatic Resource Surveys, 2026.