Geneva Lake vs Outlet To Lake Geneva
Water quality, depth, fish species, and recreation comparison.
Geneva Lake reads lower on nutrients and algae than Outlet To Lake Geneva. 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 differences in the readings here are about the lakes themselves, not the agencies sampling them. Geneva Lake reads materially cleaner than Outlet To Lake Geneva on nutrients and algae. 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 gap in the readings is decisive: Geneva Lake has the lower nutrient and algae numbers. 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 |
|---|---|---|
| Water Clarity | 21 ft | No data |
| Phosphorus | 13 µg/L Better | 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 |
A green ✓ marks the better value for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better). Surface area and trophic state carry no tick — a bigger lake is not a better lake.
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Verdict
Geneva Lake reads lower on nutrients and algae than Outlet To Lake Geneva. For fishing diversity, Geneva Lake also leads with 6 species.
Source: EPA National Aquatic Resource Surveys, 2026.