Ohio County Lake Quality
Kentucky, 3 lakes, average grade B (Good)
Ohio County has 3 monitored 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. Every one of those lakes carries an A–F grade, so the county-level summary covers the full set rather than a monitored subset. With an average grade of B, Ohio County sits comfortably above the Kentucky 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 Lake Washburn (B); the most-stressed is Lake Washburn (B).
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Quick Answers for Ohio County
Planning a trip? Check special fishing regulations for Lake Washburn — or check the official Kentucky fishing regulations.
All Lakes in Ohio County
3 lakes3 graded lakes
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BLake WashburnOhio | B | No recent samples | 30 µg/L | No recent samples | No recent samples | ✓ Public |
| 2 | BIsland LakeOhio | B | No recent samples | 23.5 µg/L | No recent samples | No recent samples | ✓ Public |
| 3 | BSouth LakeOhio | B | No recent samples | 18.5 µg/L | No recent samples | No recent samples | ✓ Public |
Lake Match
Which lake suits how you actually use one?
Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
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 United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.