Lamar County Lake Quality
Texas, 3 lakes, average grade D (Poor)
Only 3 lakes in Lamar 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, Lamar 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 Upper Pat Mayse Reservoir (C); the most-stressed is Lake Crook Mid Lake (D).
Quick Answers for Lamar County
Planning a trip? Check special fishing regulations for Upper Pat Mayse Reservoir — or check the official Texas fishing regulations.
All Lakes in Lamar County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Upper Pat Mayse Reservoir | C | 3.1 ft | 30 µg/L |
| 2 | Pat Mayse Reservoir | C | 3.9 ft | 30 µg/L |
| 3 | Lake Crook Mid Lake | D | 1.6 ft | 85 µg/L |
Other Counties in Texas
See how Lamar 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 Lamar County
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Source: EPA National Aquatic Resource Surveys, 2026.