Sumner County Lake Quality
Tennessee, 3 lakes, average grade D (Poor)
Only 3 lakes in Sumner 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, Sumner 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. Portland Lake (D) is the cleanest in the county.
Quick Answers for Sumner County
Planning a trip? Check special fishing regulations for Portland Lake — or check the official Tennessee fishing regulations.
All Lakes in Sumner County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Portland Lake | D | - | 67.9 µg/L |
| 2 | Drakes Creek Lake | F | - | 179 µg/L |
Other Counties in Tennessee
See how Sumner 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 Sumner County
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Source: EPA National Aquatic Resource Surveys, 2026.