Sheboygan County Lake Quality
Wisconsin, 6 lakes, average grade B (Good)
Only 6 lakes in Sheboygan County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Crystal Lake (A) is the cleanest in the county.
Quick Answers for Sheboygan County
Planning a trip? Check special fishing regulations for Crystal Lake, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Sheboygan County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Crystal Lake | A | 19.9 ft | - | 12.2 µg/L |
| 2 | Little Elkhart Lake | A | 10 ft | 25 ft | 17.3 µg/L |
| 3 | Elkhart Lake | A | 10.5 ft | 119 ft | 13.7 µg/L |
| 4 | Lake Ellen | B | 9 ft | 42 ft | 12.4 µg/L |
| 5 | Random Lake | C | 4.5 ft | 22.2 ft | 21.8 µg/L |
| 6 | Dewitt Road-Cedar Grove Lake | D | - | - | 73.9 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.