Little Mcdonald Lake vs Little Pine Lake
Water quality, depth, fish species, and recreation comparison.
Little Mcdonald Lake reads lower on nutrients and algae than Little Pine Lake. Both are in Otter Tail County, Minnesota.
Little Mcdonald Lake and Little Pine 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 meaningfully apart: Little Mcdonald Lake carries clearly lower phosphorus and chlorophyll-a readings than Little Pine Lake. A spread that wide reflects real underlying differences, in watershed inputs, depth profiles, or monitoring rigor.
For a recreational visitor, the wider gap in the readings is decisive: Little Mcdonald Lake has the lower nutrient and algae numbers. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Little Mcdonald Lake
Crystal clear, you can see 26.5 ft down.
Little Pine Lake
Moderate clarity, visible to about 9.5 ft.
Side-by-Side Metrics
| Metric | Little Mcdonald Lake | Little Pine Lake |
|---|---|---|
| Water Clarity | 26.5 ft Better | 9.5 ft |
| Phosphorus | 7 µg/L Better | 26 µg/L |
| Chlorophyll-a (Algae) | 1.8 µg/L Better | 10.1 µg/L |
| Maximum Depth | 109 ft Better | 63 ft |
| Surface Area | 1,316 acres | 2,080 acres |
| Public Access | Yes | Yes |
| Fish Species | 14 | 20 Better |
| Trophic State | oligotrophic | 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
Little Mcdonald Lake reads lower on nutrients and algae than Little Pine Lake. Water clarity: 26.5 ft vs 9.5 ft. For more fish-species variety, Little Pine Lake edges ahead with 20 documented species.
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Source: EPA National Aquatic Resource Surveys, 2026.