Little Mcdonald Lake vs Little Pine Lake
Water quality, depth, fish species, and recreation comparison.
Little Mcdonald Lake has a higher water quality grade (A, Excellent) than Little Pine Lake (C, Fair). 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 grades are meaningfully apart: Little Mcdonald Lake grades a A while Little Pine Lake grades a C. That two-letter spread reflects real underlying differences — different watershed inputs, different depth profiles, or different monitoring rigor.
For a recreational visitor, the wider grade gap is decisive — Little Mcdonald Lake is the better water-quality choice. 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 |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 26.5 ft | 9.5 ft |
| Phosphorus | 7 µg/L | 26 µg/L |
| Chlorophyll-a (Algae) | 1.8 µg/L | 10.1 µg/L |
| Maximum Depth | 109 ft | 63 ft |
| Surface Area | 1,316 acres | 2,080 acres |
| Public Access | Yes | Yes |
| Fish Species | 14 | 20 |
| Trophic State | oligotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Little Mcdonald Lake wins on overall water quality with a Grade A versus Little Pine Lake's Grade C. Water clarity: 26.5 ft vs 9.5 ft. For more fish-species variety, Little Pine Lake edges ahead with 20 documented species.
Source: EPA National Aquatic Resource Surveys, 2026.