Clark County Lake Quality
Missouri, 2 lakes, average grade B (Good)
Only 2 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. With an average grade of B, Clark County sits comfortably above the Missouri median.
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 Fox Valley Lake (B); the most-stressed is Lake of the Oaks (C).
Quick Answers for Clark County
Planning a trip? Check special fishing regulations for Fox Valley Lake — or check the official Missouri fishing regulations.
All Lakes in Clark County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Fox Valley Lake | B | 8.5 ft | 16.5 µg/L |
| 2 | Lake of the Oaks | C | - | 47 µg/L |
Other Counties in Missouri
See how Clark County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
Where to stay near Clark County
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Source: EPA National Aquatic Resource Surveys, 2026.