Clark County Lake Quality
Ohio, 3 lakes, average grade F (Algae-prone)
Clark County holds 3 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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 Buck Creek Lake (F); the most-stressed is Buck Creek Lake (F).
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Quick Answers for Clark County
Planning a trip? Check special fishing regulations for Buck Creek Lake — or check the official Ohio fishing regulations.
All Lakes in Clark County
3 lakes · 1 graded, 2 not rated1 graded lake · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | FBuck Creek LakeClark | F | 2.5 ft | 41.5 µg/L | 36.8 µg/L | No recent samples | Not recorded |
| NRLake SylvanClark | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRClark LakeClark | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Ohio
See how Clark 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.