Geneva Lake vs Outlet To Lake Geneva
Water quality, depth, fish species, and recreation comparison.
Geneva Lake has a higher water quality grade (A, Excellent) than Outlet To Lake Geneva (D, Poor). Both are in Walworth County, Wisconsin.
Both Geneva Lake and Outlet To Lake Geneva 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. Geneva Lake (A) is materially cleaner than Outlet To Lake Geneva (D). 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 — Geneva 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?
Geneva Lake
Crystal clear, you can see 21 ft down.
Outlet To Lake Geneva
No clarity data.
Side-by-Side Metrics
| Metric | Geneva Lake | Outlet To Lake Geneva |
|---|---|---|
| Overall Grade | A (Excellent) | D (Poor) |
| Water Clarity | 21 ft | No data |
| Phosphorus | 13 µg/L | 658 µg/L |
| Chlorophyll-a (Algae) | 2.1 µg/L | No data |
| Maximum Depth | 135 ft | 135 ft |
| Surface Area | 5,401 acres | 5,401 acres |
| Public Access | Yes | Yes |
| Fish Species | 6 | 6 |
| Trophic State | oligotrophic | hypereutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Geneva Lake wins on overall water quality with a Grade A versus Outlet To Lake Geneva's Grade D. For fishing diversity, Geneva Lake also leads with 6 species.
Source: EPA National Aquatic Resource Surveys, 2026.