Billy Boy Flowage Lake vs Birch Lake
Water quality, depth, fish species, and recreation comparison.
Billy Boy Flowage Lake has a higher water quality grade (A, Excellent) than Birch Lake (D, Poor). Both are in Sawyer County, Wisconsin.
Both Billy Boy Flowage Lake and Birch 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 meaningfully apart: Billy Boy Flowage Lake grades a A while Birch Lake grades a D. 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 — Billy Boy Flowage 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?
Billy Boy Flowage Lake
No clarity data.
Birch Lake
No clarity data.
Side-by-Side Metrics
| Metric | Billy Boy Flowage Lake | Birch Lake |
|---|---|---|
| Overall Grade | A (Excellent) | D (Poor) |
| Water Clarity | No data | No data |
| Phosphorus | 15 µg/L | 60.3 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | - |
| Surface Area | 8.5K acres | 2.3K acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | mesotrophic | eutrophic |
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 Birch Lake's Grade D. For fishing diversity, Billy Boy Flowage Lake also leads with 0 species.