Benton County Lake Quality
Tennessee, 1 lakes, average grade D (Poor)
Only 1 lakes in Benton 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. On average, Benton County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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. Big Sandy River Lake (D) is the cleanest in the county.
Quick Answers for Benton County
Planning a trip? Check special fishing regulations for Big Sandy River Lake — or check the official Tennessee fishing regulations.
All Lakes in Benton County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Big Sandy River Lake | D | - | 64 µg/L |
Other Counties in Tennessee
See how Benton 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 Benton County
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Source: EPA National Aquatic Resource Surveys, 2026.