Lewis County Lake Quality
Missouri, 1 lakes, average grade D (Poor)
Lewis County has 1 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. On average, Lewis County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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 Deer Ridge Comm. Lake (D); the most-stressed is Deer Ridge Comm. Lake (D).
Quick Answers for Lewis County
Planning a trip? Check special fishing regulations for Deer Ridge Comm. Lake — or check the official Missouri fishing regulations.
All Lakes in Lewis County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Deer Ridge Comm. Lake | D | 2.9 ft | 44 µg/L |
Other Counties in Missouri
See how Lewis County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 16 states.
Where to stay near Lewis County
Top-rated places to stay near Lewis County
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Source: EPA National Aquatic Resource Surveys, 2026.