Polk County Lake Quality
Tennessee, 3 lakes, average grade B (Good)
Only 3 lakes in Polk 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. With an average grade of B, Polk County sits comfortably above the {{stateName}} median.
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 Polk County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Tennessee fishing regulations.
All Lakes in Polk County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | A | 5.4 ft | 15.2 µg/L |
| 2 | Ocoee River Lake | B | 7.5 ft | 16.5 µg/L |
| 3 | Nla Lake | C | 16.4 ft | 21000 µg/L |
Other Counties in Tennessee
See how Polk 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 Polk County
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Source: EPA National Aquatic Resource Surveys, 2026.