Hopkins County Lake Quality
Kentucky, 4 lakes, average grade C (Fair)
Only 4 lakes in Hopkins County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. 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. Nla Lake (A) is the cleanest in the county.
Quick Answers for Hopkins County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Kentucky fishing regulations.
All Lakes in Hopkins County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | A | 8 ft | 11.1 µg/L |
| 2 | Lake Peewee | C | - | 32.3 µg/L |
| 3 | Loch Mary Reservoir | C | - | 26 µg/L |
| 4 | Grapevine Lake | C | - | 25 µg/L |
Other Counties in Kentucky
See how Hopkins 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 Hopkins County
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Source: EPA National Aquatic Resource Surveys, 2026.