Delta County Lake Quality
Texas, 3 lakes, average grade D (Poor)
Only 3 lakes in Delta 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, Delta 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 Cooper Lake (C); the most-stressed is Jim L Chapman Lake (D).
Quick Answers for Delta County
Planning a trip? Check special fishing regulations for Cooper Lake — or check the official Texas fishing regulations.
All Lakes in Delta County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Cooper Lake | C | 2.4 ft | 50 µg/L |
| 2 | Jim L Chapman Lake | D | 1.2 ft | - |
| 3 | Big Creek Lake | D | 1.5 ft | 111 µg/L |
Other Counties in Texas
See how Delta County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 17 states.
Where to stay near Delta County
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Source: EPA National Aquatic Resource Surveys, 2026.