Blue Spring Lake vs Rock Lake
Water quality, depth, fish species, and recreation comparison.
Rock Lake has a higher water quality grade (A, Excellent) than Blue Spring Lake (C, Fair). Both are in Jefferson County, Wisconsin.
Both Blue Spring Lake and Rock Lake sit in Wisconsin. 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. Rock Lake (A) is materially cleaner than Blue Spring Lake (C). 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 grade gap is decisive — Rock 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?
Blue Spring Lake
Murky, only visible to about 6 ft.
Rock Lake
Good clarity, visible to about 12.5 ft.
Side-by-Side Metrics
| Metric | Blue Spring Lake | Rock Lake |
|---|---|---|
| Overall Grade | C (Fair) | A (Excellent) |
| Water Clarity | 6 ft | 12.5 ft |
| Phosphorus | 23.8 µg/L | 17.9 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | - |
| Surface Area | 136 acres | 1.4K acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | eutrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Rock Lake wins on overall water quality with a Grade A versus Blue Spring Lake's Grade C. Water clarity: 12.5 ft vs 6 ft. For fishing diversity, Rock Lake also leads with 0 species.