Maries County Lake Quality
Missouri, 1 lakes, average grade C (Fair)
Maries 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. Maries County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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 Rinquelin Trail Comm. Lake (C); the most-stressed is Rinquelin Trail Comm. Lake (C).
Quick Answers for Maries County
Planning a trip? Check special fishing regulations for Rinquelin Trail Comm. Lake — or check the official Missouri fishing regulations.
All Lakes in Maries County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Rinquelin Trail Comm. Lake | C | 4.5 ft | 39 µg/L |
Other Counties in Missouri
See how Maries 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 Maries County
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Source: EPA National Aquatic Resource Surveys, 2026.