Delavan Lake vs Geneva Lake
Water quality, depth, fish species, and recreation comparison.
Geneva Lake has a higher water quality grade (A, Excellent) than Delavan Lake (B, Good). Both are in Walworth County, Wisconsin.
Delavan Lake and Geneva Lake 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. These two are within a letter of each other on the rubric — Delavan Lake (B) versus Geneva Lake (A). The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
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.
Delavan Lake
Moderate clarity, visible to about 9.1 ft.
Geneva Lake
Crystal clear, you can see 20.2 ft down.
Side-by-Side Metrics
| Metric | Delavan Lake | Geneva Lake |
|---|---|---|
| Overall Grade | B (Good) | A (Excellent) |
| Water Clarity | 9.1 ft | 20.2 ft |
| Phosphorus | 27 µg/L | 13 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 52 ft | 135 ft |
| Surface Area | 1.9K acres | 5.4K acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | mesotrophic | oligotrophic |
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 Delavan Lake's Grade B. Water clarity: 20.2 ft vs 9.1 ft. For fishing diversity, Geneva Lake also leads with 0 species.