Ocauchee Lake vs Oconomowoc Lake Site
Water quality, depth, fish species, and recreation comparison.
Ocauchee Lake and Oconomowoc Lake Site both received the same overall water quality grade of B (Good). Both are in Waukesha County, Wisconsin.
Both Ocauchee Lake and Oconomowoc Lake Site sit in Wisconsin. A same-state comparison strips out the state-level water-quality regime as a variable: any grade differences here are about the lakes themselves, not the agencies grading them. The grades are close: Ocauchee Lake (B) and Oconomowoc Lake Site (B) 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.
Ocauchee Lake
Murky, only visible to about 6.6 ft.
Oconomowoc Lake Site
Good clarity, visible to about 13 ft.
Side-by-Side Metrics
| Metric | Ocauchee Lake | Oconomowoc Lake Site |
|---|---|---|
| Overall Grade | B (Good) | B (Good) |
| Water Clarity | 6.6 ft | 13 ft |
| Phosphorus | 17.5 µg/L | 13.8 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 90 ft | 60 ft |
| Surface Area | 1,210 acres | 818 acres |
| Public Access | Yes | Unknown |
| Fish Species | 6 | 5 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade B. The tiebreakers come down to clarity (Ocauchee Lake: 6.6 ft, Oconomowoc Lake Site: 13 ft) and what you want from the lake. Ocauchee Lake supports more documented fish species.
Source: EPA National Aquatic Resource Surveys, 2026.