Lake J.B. Thomas Water Level

As of 2026-08-14, Lake J.B. Thomas sits at 2227.78 ft, which is about average for this time of year.Over the past 30 days the level has fallen 0.29 ft.

The most recent reading is 2227.78 ft (2026-08-14), sourced from the Texas Water Development Board. Readings on this page refresh automatically as the agency publishes new data.

The highest level in our records is 2240.05 ft on 2021-08-16. The lowest is 2223.63 ft on 2024-08-29. Our record covers about 5.0 years of readings.

Compared with every August in our records, the current level is higher than 40% of them — about average for this time of year. Seasonal comparison matters more than the raw number, because most reservoirs draw down predictably through late summer and refill over winter and spring.

Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Lake J.B. Thomas has fallen 0.29 ft over the past 30 days. For the operational reason on any given week, check the Texas Water Development Board directly.

The level is -7.50 ft compared with this date last year (2227.78 ft today). The full-history chart above covers 5.0 years, with a record high of 2240.05 ft and a record low of 2223.63 ft.