Lake J.B. Thomas, TX

Lake J.B. Thomas is at 19.2% of conservation capacity as of 2026-10-13, which we classify as very low. That is 32.43 ft below full pool of 2258.00 ft. Over the past 30 days the level has fallen 1.05 ft.

The most recent reading at Lake J.B. Thomas is 2225.57 ft (2026-10-13), sourced from the Texas Water Development Board. Readings on this page refresh automatically as the agency publishes new data.

The highest level for Lake J.B. Thomas in our records is 2251.94 ft on 2015-07-11. The lowest is 2200.55 ft on 2012-09-13. Our record covers about 27 years of readings.

Compared with every October in our records, the current level is higher than 52% of them, which we classify as very low. 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 1.05 ft over the past 30 days. For the operational reason on any given week, check the Texas Water Development Board directly.

Lake J.B. Thomas is -8.09 ft compared with this date last year (2225.57 ft today). The full-history chart above covers 27 years, with a record high of 2251.94 ft and a record low of 2200.55 ft.