Reservoir · Texas · United States · USGS NWIS
Lake J. B. Thomas
23.1% full
Capacity
247.44 hm³
Volume stored
57 hm³
Coordinates
32.593°N, 101.138°W
Last updated
2026-08-13
Current fill
23.1%vs 7 days ago
-0.5%losing
vs 1 year ago
-13.8%year-over-year
7-day trend
→stable
Data source: USGS National Water Information System (NWIS) — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-08-13.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 32.593, -101.138 · Open in Google Maps
About Lake J. B. Thomas
As of August 13, 2026, Lake J. B. Thomas is filled to 23.1% of its total capacity, holding roughly 57 hm³ of water out of a maximum 247 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.5 pts), and it is 13.8 points below its level on the same date a year earlier.
Across the readings we hold for Lake J. B. Thomas — 1461 data points between August 14, 2022 and August 13, 2026 — the level has ranged from a low of 16.7% (August 28, 2024) to a high of 43.8% (November 21, 2024). On average the reservoir is fullest around November and at its lowest around August.
It is operated by USGS primarily for multiple purposes. It lies within the Texas basin at 32.593°N, 101.138°W.
Key facts
- Current fill level
- 23.1%
- Water stored
- 57 hm³
- Total capacity
- 247 hm³
- 7-day change
- ▼ 0.5 pts
- Year-on-year
- ▼ 13.8 pts
- Primary use
- Multipurpose
- River basin
- Texas
- Operator
- USGS
- Coordinates
- 32.593°N, 101.138°W
- Last updated
- August 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Aug 2026 | 23.1% | 57 |
| 12 Aug 2026 | 23.2% | 57 |
| 11 Aug 2026 | 23.2% | 58 |
| 10 Aug 2026 | 23.3% | 58 |
| 9 Aug 2026 | 23.4% | 58 |
| 8 Aug 2026 | 23.5% | 58 |
| 7 Aug 2026 | 23.5% | 58 |
| 6 Aug 2026 | 23.6% | 58 |
| 5 Aug 2026 | 23.7% | 59 |
| 4 Aug 2026 | 23.8% | 59 |
| 3 Aug 2026 | 23.8% | 59 |
| 2 Aug 2026 | 23.9% | 59 |
Frequently asked questions
What is the current water level of Lake J. B. Thomas?
As of August 13, 2026, Lake J. B. Thomas is at 23.1% of its capacity, holding approximately 57 hm³ of water, according to USGS NWIS data.
Is Lake J. B. Thomas reservoir full?
No. As of August 13, 2026, Lake J. B. Thomas is low at 23.1% of its capacity, so it is not full.
Is the water level at Lake J. B. Thomas rising or falling?
The level at Lake J. B. Thomas has been broadly stable over the latest week on record (-0.5 points).
How much water can Lake J. B. Thomas hold?
Lake J. B. Thomas has a total capacity of 247 hm³.
Where is Lake J. B. Thomas reservoir located?
Lake J. B. Thomas is located in Texas, United States, within the Texas basin (coordinates 32.593°N, 101.138°W).
What is Lake J. B. Thomas used for?
Lake J. B. Thomas is used primarily for multiple purposes, and is managed by USGS.