Lake J.B. Thomas water level
▼ 14.4 points from 34.6% a year ago
Source: waterdata.usgs.gov/monitoring-location/USGS-08118000, accessed October 1, 2026. Updated every 6 hours.
Lake J.B. Thomas is at 20.2% of full pool (2226.04 ft) as of September 29, 2026. Lake J.B. Thomas was last full on January 13, 1963 (95% of normal storage). Lake J.B. Thomas is near Vincent, Texas.
Lake J.B. Thomas level history
This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Highs and lows are daily readings in the published data, not official records. Source: USGS daily data.
Storage, % of full pool, since 1954
Lake J.B. Thomas is falling: 20.3% full, down 0.2 percentage points since September 27, 2026.
On this same date last year (September 28, 2025), Lake J.B. Thomas was 34.6% full, 14.3 percentage points higher than today's 20.3%.
Weekly averages of the source's daily readings; older years may be monthly or sparser where that is all the source published. Download the charted data (JSON).
Lake J.B. Thomas map
Lake J.B. Thomas is at 32.5932, -101.1382. Open in OpenStreetMap.
The dam
- Recreation
- Water supply
Sources: nid.sec.usace.army.mil, accessed September 29, 2026
On the water
No campgrounds, boat ramps, or swim spots linked to Lake J.B. Thomas yet.
Common questions
- Lake J.B. Thomas is at 20.2% of full pool (2226.04 ft) as of September 29, 2026.
- Lake J.B. Thomas was last full on January 13, 1963, when it held 95% of its normal storage. This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Based on USGS daily data since January 1, 1954.
- In USGS daily data since January 1, 1954, Lake J.B. Thomas's highest storage was 108.8% of normal storage on September 8, 1962. Its lowest after it first filled (May 13, 1958) was 0.4% of normal storage on September 14, 2012. These are the highest and lowest daily readings in the published data, not official records.
- Lake J.B. Thomas is near Vincent, Texas (32.5932, -101.1382).
- Local Government operates the dam at Lake J.B. Thomas.
- Lake J.B. Thomas's dam is used for Recreation, Water supply.