
Big Butternut Lake vs Bone Lake
Water quality, depth, fish species, and recreation comparison.
Bone Lake reads lower on nutrients and algae than Big Butternut Lake. Both are in Polk County, Wisconsin.
Big Butternut Lake and Bone Lake are both in Wisconsin — 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. Bone Lake reads materially cleaner than Big Butternut Lake on nutrients and algae. A gap that wide is unlikely to close in a single year of remediation work; it reflects multi-decade differences in the lakes themselves.
For a recreational visitor, the wider gap in the readings is decisive: Bone 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 Butternut Lake
Murky, only visible to about 4.5 ft.
Bone Lake
Moderate clarity, visible to about 8 ft.
Side-by-Side Metrics
| Metric | Big Butternut Lake | Bone Lake |
|---|---|---|
| Water Clarity | 4.5 ft | 8 ft Better |
| Phosphorus | 62.1 µg/L | 19.8 µg/L Better |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 19 ft | 43 ft Better |
| Surface Area | 384 acres | 1,667 acres |
| Public Access | Yes | Yes |
| Fish Species | 4 | 4 |
| Trophic State | eutrophic | mesotrophic |
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.
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Verdict
Bone Lake reads lower on nutrients and algae than Big Butternut Lake. Water clarity: 8 ft vs 4.5 ft. For fishing diversity, Bone Lake also leads with 4 species.
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Source: EPA National Aquatic Resource Surveys, 2026.