Ralls County Lake Quality
Missouri, 4 lakes, average grade D (Poor)
Ralls County has 4 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, Ralls 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 Mark Twain Lake Indian Creek Arm (C); the most-stressed is Perry City Lake (F).
Quick Answers for Ralls County
Planning a trip? Check special fishing regulations for Mark Twain Lake Indian Creek Arm — or check the official Missouri fishing regulations.
All Lakes in Ralls County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Mark Twain Lake Indian Creek Arm | C | 3.8 ft | 31.5 µg/L |
| 2 | Mark Twain Lake by Hwy J | C | 3.7 ft | 33.6 µg/L |
| 3 | Mark Twain Lake | D | 2.5 ft | 60.8 µg/L |
| 4 | Perry City Lake | F | - | 240 µg/L |
Other Counties in Missouri
See how Ralls 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 Ralls County
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Source: EPA National Aquatic Resource Surveys, 2026.