Geneva Lake vs Lake Beulah
Water quality, depth, fish species, and recreation comparison.
Geneva Lake has a higher water quality grade (A, Excellent) than Lake Beulah (C, Fair). 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. Geneva Lake (A) is materially cleaner than Lake Beulah (C). 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 20.2 ft down.
Lake Beulah
Very murky, less than 2.6 ft of visibility.
Side-by-Side Metrics
| Metric | Geneva Lake | Lake Beulah |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 20.2 ft | 2.6 ft |
| Phosphorus | 13 µg/L | 18 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 135 ft | 58 ft |
| Surface Area | 5.4K acres | 812 acres |
| Public Access | Yes | Yes |
| Fish Species | 6 | 3 |
| Trophic State | oligotrophic | eutrophic |
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 Lake Beulah's Grade C. Water clarity: 20.2 ft vs 2.6 ft. For fishing diversity, Geneva Lake also leads with 6 species.