South Twin Lake vs Wapogasset Lake
Water quality, depth, fish species, and recreation comparison.
South Twin Lake has a higher water quality grade (A, Excellent) than Wapogasset Lake (C, Fair). Both are in Polk County, Wisconsin.
South Twin Lake and Wapogasset 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. The grades are meaningfully apart: South Twin Lake grades a A while Wapogasset Lake grades a C. 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 — South Twin 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?
South Twin Lake
No clarity data.
Wapogasset Lake
Murky, only visible to about 6 ft.
Side-by-Side Metrics
| Metric | South Twin Lake | Wapogasset Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | No data | 6 ft |
| Phosphorus | 11.7 µg/L | 30.6 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | 32 ft |
| Surface Area | 639 acres | 1.2K acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | oligotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
South Twin Lake wins on overall water quality with a Grade A versus Wapogasset Lake's Grade C. For fishing diversity, South Twin Lake also leads with 0 species.