Clark County Lake Quality
Wisconsin, 4 lakes, average grade D (Poor)
Only 4 lakes in Clark 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 grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.
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. Buck Creek Lake (D) is the cleanest in the county.
Quick Answers for Clark County
Planning a trip? Check special fishing regulations for Buck Creek Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Clark County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Buck Creek Lake | D | 2.5 ft | - | 41.5 µg/L |
| 2 | Buck Creek Lake | D | 2.3 ft | - | 43.5 µg/L |
| 3 | Buck Creek Lake | D | 2.1 ft | - | 44.5 µg/L |
| 4 | Buck Creek Lake | D | 2.5 ft | - | 40.5 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.