Big Swan Lake vs Francis Lake
Water quality, depth, fish species, and recreation comparison.
Francis Lake reads lower on nutrients and algae than Big Swan Lake. Both are in Meeker County, Minnesota.
Big Swan Lake and Francis 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 readings are meaningfully apart: Francis Lake carries clearly lower phosphorus and chlorophyll-a readings than Big Swan Lake. A spread that wide reflects real underlying differences, in watershed inputs, depth profiles, or monitoring rigor.
For a recreational visitor, the wider gap in the readings is decisive: Francis Lake has the lower nutrient and algae numbers. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Big Swan Lake
Very murky, less than 2.6 ft of visibility.
Francis Lake
Murky, only visible to about 6.5 ft.
Side-by-Side Metrics
| Metric | Big Swan Lake | Francis Lake |
|---|---|---|
| Water Clarity | 2.6 ft | 6.5 ft Better |
| Phosphorus | 86.5 µg/L | 23 µg/L Better |
| Chlorophyll-a (Algae) | 61.3 µg/L | 8.9 µg/L Better |
| Maximum Depth | 32 ft Better | 17 ft |
| Surface Area | 684 acres | 1,053 acres |
| Public Access | Yes | Yes |
| Fish Species | 23 Better | 14 |
| Trophic State | eutrophic | eutrophic |
A green ✓ marks the better value for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better). Surface area and trophic state carry no tick — a bigger lake is not a better lake.
Swap a lake
Compare Big Swan Lake or Francis Lake against a different lake.
Verdict
Francis Lake reads lower on nutrients and algae than Big Swan Lake. Water clarity: 6.5 ft vs 2.6 ft. For more fish-species variety, Big Swan Lake edges ahead with 23 documented species.
Source: EPA National Aquatic Resource Surveys, 2026.