Buchanan Lake vs Eagle Lake
Water quality, depth, fish species, and recreation comparison.
Eagle Lake has a higher water quality grade (A, Excellent) than Buchanan Lake (C, Fair). Both are in Otter Tail County, Minnesota.
Buchanan Lake and Eagle 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: Eagle Lake grades a A while Buchanan 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 — Eagle 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?
Buchanan Lake
Murky, only visible to about 5.5 ft.
Eagle Lake
Crystal clear, you can see 22.6 ft down.
Side-by-Side Metrics
| Metric | Buchanan Lake | Eagle Lake |
|---|---|---|
| Overall Grade | C (Fair) | A (Excellent) |
| Water Clarity | 5.5 ft | 22.6 ft |
| Phosphorus | 22 µg/L | 5 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 42 ft | 46 ft |
| Surface Area | 963.59 acres | 907.4 acres |
| Public Access | Yes | Yes |
| Fish Species | 8 | 10 |
| Trophic State | eutrophic | oligotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Eagle Lake wins on overall water quality with a Grade A versus Buchanan Lake's Grade C. Water clarity: 22.6 ft vs 5.5 ft. For fishing diversity, Eagle Lake also leads with 10 species.