Geneva Lake vs Lake Beulah
Water quality, depth, fish species, and recreation comparison.
Geneva Lake and Lake Beulah read the same on nutrients and algae. Both are in Walworth County, Wisconsin.
Geneva Lake and Lake Beulah 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: Geneva Lake and Lake Beulah 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.
Geneva Lake
Crystal clear, you can see 21 ft down.
Lake Beulah
Good clarity, visible to about 10 ft.
Side-by-Side Metrics
| Metric | Geneva Lake | Lake Beulah |
|---|---|---|
| Water Clarity | 21 ft Better | 10 ft |
| Phosphorus | 13 µg/L Better | 13.4 µg/L |
| Chlorophyll-a (Algae) | 2.1 µg/L Better | 2.5 µg/L |
| Maximum Depth | 135 ft Better | 58 ft |
| Surface Area | 5,401 acres | 812 acres |
| Public Access | Yes | Yes |
| Fish Species | 6 Better | 3 |
| Trophic State | oligotrophic | mesotrophic |
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.
Swap a lake
Compare Geneva Lake or Lake Beulah against a different lake.
Verdict
Both lakes earn the same Grade A. The tiebreakers come down to clarity (Geneva Lake: 21 ft, Lake Beulah: 10 ft) and what you want from the lake. Geneva Lake supports more documented fish species.
Source: EPA National Aquatic Resource Surveys, 2026.