Big Pine Lake vs Ml-Garrison Lake
Water quality, depth, fish species, and recreation comparison.
Big Pine Lake has a higher water quality grade (A, Excellent) than Ml-Garrison Lake (C, Fair). Both are in Aitkin County, Minnesota.
Both Big Pine Lake and Ml-Garrison Lake sit in Minnesota. A same-state comparison strips out the state-level water-quality regime as a variable: any grade differences here are about the lakes themselves, not the agencies grading them. The grades are meaningfully apart: Big Pine Lake grades a A while Ml-Garrison 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 — Big Pine 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?
Big Pine Lake
Crystal clear, you can see 17 ft down.
Ml-Garrison Lake
Murky, only visible to about 6.2 ft.
Side-by-Side Metrics
| Metric | Big Pine Lake | Ml-Garrison Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 17 ft | 6.2 ft |
| Phosphorus | 15 µg/L | 26 µg/L |
| Chlorophyll-a (Algae) | 1.6 µg/L | 4.7 µg/L |
| Maximum Depth | 78 ft | 42 ft |
| Surface Area | 638 acres | 128,250 acres |
| Public Access | Yes | Yes |
| Fish Species | 15 | 21 |
| Trophic State | oligotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Big Pine Lake wins on overall water quality with a Grade A versus Ml-Garrison Lake's Grade C. Water clarity: 17 ft vs 6.2 ft. For more fish-species variety, Ml-Garrison Lake edges ahead with 21 documented species.
Source: EPA National Aquatic Resource Surveys, 2026.