Nagawicka Lake vs Okauchee Lake
Water quality, depth, fish species, and recreation comparison.
Okauchee Lake has a higher water quality grade (A, Excellent) than Nagawicka Lake (B, Good). Both are in Waukesha County, Wisconsin.
Both Nagawicka Lake and Okauchee Lake 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: Nagawicka Lake (B) and Okauchee Lake (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.
Nagawicka Lake
Moderate clarity, visible to about 9.5 ft.
Okauchee Lake
Good clarity, visible to about 11.5 ft.
Side-by-Side Metrics
| Metric | Nagawicka Lake | Okauchee Lake |
|---|---|---|
| Overall Grade | B (Good) | A (Excellent) |
| Water Clarity | 9.5 ft | 11.5 ft |
| Phosphorus | 13.5 µg/L | 18 µg/L |
| Chlorophyll-a (Algae) | No data | 3.9 µg/L |
| Maximum Depth | 90 ft | 90 ft |
| Surface Area | 981 acres | 1,210 acres |
| Public Access | Yes | Yes |
| Fish Species | 5 | 6 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Okauchee Lake wins on overall water quality with a Grade A versus Nagawicka Lake's Grade B. Water clarity: 11.5 ft vs 9.5 ft. For fishing diversity, Okauchee Lake also leads with 6 species.
Source: EPA National Aquatic Resource Surveys, 2026.