Big Sand Lake vs Potato Lake
Water quality, depth, fish species, and recreation comparison.
Big Sand Lake has a higher water quality grade (A, Excellent) than Potato Lake (C, Fair). Both are in Hubbard County, Minnesota.
Big Sand Lake and Potato 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: Big Sand Lake grades a A while Potato 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 Sand 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 Sand Lake
Crystal clear, you can see 23 ft down.
Potato Lake
Moderate clarity, visible to about 7 ft.
Side-by-Side Metrics
| Metric | Big Sand Lake | Potato Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 23 ft | 7 ft |
| Phosphorus | 7 µg/L | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 135 ft | 76 ft |
| Surface Area | 1.6K acres | 1.6K acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | oligotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Big Sand Lake wins on overall water quality with a Grade A versus Potato Lake's Grade C. Water clarity: 23 ft vs 7 ft. For fishing diversity, Big Sand Lake also leads with 1 species.