Geneva Lake vs Lake Beulah
Water quality, depth, fish species, and recreation comparison.
Geneva Lake and Lake Beulah both received the same overall water quality grade of A (Excellent). 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 grades are close: Geneva Lake (A) and Lake Beulah (A) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.
With grades 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 |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 21 ft | 10 ft |
| Phosphorus | 13 µg/L | 13.4 µg/L |
| Chlorophyll-a (Algae) | 2.1 µg/L | 2.5 µg/L |
| Maximum Depth | 135 ft | 58 ft |
| Surface Area | 5,401 acres | 812 acres |
| Public Access | Yes | Yes |
| Fish Species | 6 | 3 |
| Trophic State | oligotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
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.