San Augustine County Lake Quality
Texas, 3 lakes, average grade D (Poor)
Only 3 lakes in San Augustine 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, San Augustine County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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. Sam Rayburn Reservoir (C) is the cleanest in the county.
Quick Answers for San Augustine County
Planning a trip? Check special fishing regulations for Sam Rayburn Reservoir — or check the official Texas fishing regulations.
All Lakes in San Augustine County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Sam Rayburn Reservoir | C | 3.9 ft | 27.5 µg/L |
| 2 | Sam Rayburn Reservoir | D | 1.3 ft | 80 µg/L |
| 3 | Sam Rayburn Reservoir | D | 1.8 ft | 60 µg/L |
Other Counties in Texas
See how San Augustine 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 San Augustine County
Top-rated places to stay near San Augustine County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to San Augustine County?
Get lake water-quality report cards plus the best cabin & lodging deals near San Augustine County — straight to your inbox. No spam, unsubscribe anytime.
Source: EPA National Aquatic Resource Surveys, 2026.