Obion County Lake Quality
Tennessee, 8 lakes, average grade D (Nutrient-rich)
Obion County has 8 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. 2 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. On average, Obion County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Reelfoot Lake Upper Blue Basin (D); the most-stressed is Reelfoot Lake Upper Blue Basin (D).
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Quick Answers for Obion County
Planning a trip? Check special fishing regulations for Reelfoot Lake Upper Blue Basin — or check the official Tennessee fishing regulations.
All Lakes in Obion County
8 lakes · 2 graded, 6 not rated2 graded lakes · 6 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DReelfoot Lake Upper Blue BasinObion | D | No recent samples | 276 µg/L | No recent samples | No recent samples | ✓ Public |
| 2 | DReelfoot Lake-Reelfoot Creek EmbaymentObion | D | No recent samples | 193.5 µg/L | No recent samples | No recent samples | ✓ Public |
| NRCarey BasinObion | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRRat PocketObion | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRMud BasinObion | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRReelfoot Indian Creek Number Ten LakeObion | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRReelfoot Indian Creek Watershed Number Seven ReservoirObion | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRHouser Creek DamObion | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Tennessee
See how Obion County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.