Ohio County Lake Quality
Kentucky, 3 lakes, average grade B (Good)
Ohio County has 3 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. With an average grade of B, Ohio County sits comfortably above the {{stateName}} 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 South Lake (B); the most-stressed is Lake Washburn (C).
Quick Answers for Ohio County
Planning a trip? Check special fishing regulations for South Lake — or check the official Kentucky fishing regulations.
All Lakes in Ohio County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | South Lake | B | - | 21.5 µg/L |
| 2 | Island Lake | B | - | 21 µg/L |
| 3 | Lake Washburn | C | - | 33 µg/L |
Other Counties in Kentucky
See how Ohio County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near Ohio County
Top-rated places to stay near Ohio County
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Source: EPA National Aquatic Resource Surveys, 2026.