Lamar County Lake Quality
Texas, 7 lakes, average grade D (Nutrient-rich)
Lamar County holds 7 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 3 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. 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 (F).
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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
7 lakes · 3 graded, 4 not rated3 graded lakes · 4 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | CUpper Pat Mayse ReservoirLamar | C | 3.1 ft | 30 µg/L | 20.4 µg/L | No recent samples | ✓ Public |
| 2 | CPat Mayse ReservoirLamar | C | 3.9 ft | 30 µg/L | 21.8 µg/L | No recent samples | ✓ Public |
| 3 | FLake Crook Mid LakeLamar | F | 1.6 ft | 85 µg/L | 50 µg/L | No recent samples | ✓ Public |
| NRGordon LakeLamar | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake GibbonsLamar | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLamar LakeLamar | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWomack LakeLamar | 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 Texas
See how Lamar 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.