Big Fish Lake vs Pearl Lake
Water quality, depth, fish species, and recreation comparison.
Big Fish Lake has a higher water quality grade (A, Excellent) than Pearl Lake (C, Fair). Both are in Stearns County, Minnesota.
Both Big Fish Lake and Pearl 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 Pearl 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 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 20.7 ft down.
Pearl Lake
Murky, only visible to about 3.9 ft.
Side-by-Side Metrics
| Metric | Big Fish Lake | Pearl Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 20.7 ft | 3.9 ft |
| Phosphorus | 9 µg/L | 34 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 70 ft | 17 ft |
| Surface Area | 557.31 acres | 753.09 acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| 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 Pearl Lake's Grade C. Water clarity: 20.7 ft vs 3.9 ft. For fishing diversity, Big Fish Lake also leads with 1 species.