Clark County Lake Quality
Wisconsin, 4 lakes, average grade F (Very 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 average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Unnamed Lake (F); the most-stressed is Unnamed Lake (F).
Quick Answers for Clark County
Planning a trip? Check special fishing regulations for Unnamed Lake, and the best times to fish — or browse the full Wisconsin regulations index.
DNR Reports (4)
Wisconsin DNR Fisheries Survey resources for lakes in Clark County. browse all reports →
- 2024Black River gamefish survey, 2024Fisheries Survey · WI DNR · 2024 (PDF)
- 2023Emerson Lake fisheries survey, 2023Fisheries Survey · WI DNR · 2023 (PDF)
- 2022Sportsmans Lake spring netting survey, 2022Netting Survey · WI DNR · 2022 (PDF)
- 2009Clark Lake Fishery Survey Report 2009Fisheries Survey · WI DNR · 2009 (PDF)
All Lakes in Clark County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Unnamed Lake | F | 1.3 ft | - | - |
| 2 | Mead Lake | F | 2 ft | 16 ft | 208 µg/L |
| 3 | Mead Lake Nb Test Site | F | 2 ft | 16 ft | - |
| 4 | Mead Lake Nb Control Site | F | 2 ft | 16 ft | - |
Source: EPA National Aquatic Resource Surveys, 2026.