Audrain County Lake Quality
Missouri, 4 lakes, average grade C (Fair)
Audrain 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. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Oasis Ranch Upper Lake (A) is the cleanest in the county.
Quick Answers for Audrain County
Planning a trip? Check special fishing regulations for Oasis Ranch Upper Lake — or check the official Missouri fishing regulations.
All Lakes in Audrain County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Oasis Ranch Upper Lake | A | 14.4 ft | 12 µg/L |
| 2 | Oasis Ranch Lake | A | 14.1 ft | 8 µg/L |
| 3 | Vandalia Community Lake | F | 1.8 ft | 110 µg/L |
| 4 | Teal Lake | F | 2 ft | 109 µg/L |
Other Counties in Missouri
See how Audrain 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 Audrain County
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Source: EPA National Aquatic Resource Surveys, 2026.