Delavan Lake vs Outlet To Lake Geneva
Water quality, depth, fish species, and recreation comparison.
Delavan Lake reads lower on nutrients and algae than Outlet To Lake Geneva. Both are in Walworth County, Wisconsin.
Delavan Lake and Outlet To Lake Geneva 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 readings are close: Delavan Lake and Outlet To Lake Geneva sit within a narrow band of each other on phosphorus, chlorophyll-a and clarity. The per-parameter table below shows where the small differences actually live.
With readings 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.
Delavan Lake
Moderate clarity, visible to about 8.9 ft.
Outlet To Lake Geneva
No clarity data.
Side-by-Side Metrics
| Metric | Delavan Lake | Outlet To Lake Geneva |
|---|---|---|
| Water Clarity | 8.9 ft | No data |
| Phosphorus | 52.5 µg/L Better | 658 µg/L |
| Chlorophyll-a (Algae) | 9.1 µg/L | No data |
| Maximum Depth | 52 ft | 135 ft Better |
| Surface Area | 1,906 acres | 5,401 acres |
| Public Access | Yes | Yes |
| Fish Species | 6 | 6 |
| Trophic State | eutrophic | 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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Compare Delavan Lake or Outlet To Lake Geneva against a different lake.
Verdict
Delavan Lake reads lower on nutrients and algae than Outlet To Lake Geneva. For fishing diversity, Delavan Lake also leads with 6 species.
Source: EPA National Aquatic Resource Surveys, 2026.