Big Fish Lake vs Horseshoe Lake
Water quality, depth, fish species, and recreation comparison.
Big Fish Lake has a higher water quality grade (A, Excellent) than Horseshoe Lake (F, Very Poor). Both are in Stearns County, Minnesota.
Both Big Fish Lake and Horseshoe 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 Fish Lake grades a A while Horseshoe Lake grades a F. 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 Fish 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 Fish Lake
Crystal clear, you can see 20 ft down.
Horseshoe Lake
Murky, only visible to about 4 ft.
Side-by-Side Metrics
| Metric | Big Fish Lake | Horseshoe Lake |
|---|---|---|
| Overall Grade | A (Excellent) | F (Very Poor) |
| Water Clarity | 20 ft | 4 ft |
| Phosphorus | 9 µg/L | 120 µg/L |
| Chlorophyll-a (Algae) | 1.8 µg/L | 44.5 µg/L |
| Maximum Depth | 70 ft | 57 ft |
| Surface Area | 557 acres | 629 acres |
| Public Access | Yes | Yes |
| Fish Species | 15 | 25 |
| Trophic State | oligotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Big Fish Lake wins on overall water quality with a Grade A versus Horseshoe Lake's Grade F. Water clarity: 20 ft vs 4 ft. For more fish-species variety, Horseshoe Lake edges ahead with 25 documented species.
Source: EPA National Aquatic Resource Surveys, 2026.