Billy Boy Flowage Lake vs Callahan Lake
Water quality, depth, fish species, and recreation comparison.
Billy Boy Flowage Lake has a higher water quality grade (A, Excellent) than Callahan Lake (B, Good). Both are in Sawyer County, Wisconsin.
Both Billy Boy Flowage Lake and Callahan 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. The grades are close: Billy Boy Flowage Lake (A) and Callahan Lake (B) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.
With grades this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.
Billy Boy Flowage Lake
No clarity data.
Callahan Lake
Good clarity, visible to about 10.6 ft.
Side-by-Side Metrics
| Metric | Billy Boy Flowage Lake | Callahan Lake |
|---|---|---|
| Overall Grade | A (Excellent) | B (Good) |
| Water Clarity | No data | 10.6 ft |
| Phosphorus | 15 µg/L | 22.3 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | - |
| Surface Area | 8.5K acres | 602 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Billy Boy Flowage Lake wins on overall water quality with a Grade A versus Callahan Lake's Grade B. For fishing diversity, Billy Boy Flowage Lake also leads with 0 species.