McMinn County Lake Quality
Tennessee, 1 lakes, average grade D (Poor)
Only 1 lakes in McMinn 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-wide average grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.
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. North Mouse Creek Lake (D) is the cleanest in the county.
Quick Answers for McMinn County
Planning a trip? Check special fishing regulations for North Mouse Creek Lake — or check the official Tennessee fishing regulations.
All Lakes in McMinn County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | North Mouse Creek Lake | D | - | 67 µg/L |
Other Counties in Tennessee
See how McMinn 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 McMinn County
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Source: EPA National Aquatic Resource Surveys, 2026.