Sam Rayburn Reservoir: 66.9% full as of 2026-09-10

Historical Data

Date Percent Full Mean Water Level
(ft) 		Reservoir Storage
(acre-ft) 		Conservation Storage
(acre-ft) 		Conservation Capacity
(acre-ft) 		Surface Area
(acres)
Today 2026-09-10 66.9 154.94 1,929,835 1,910,879 2,857,077 85,932
Yesterday 2026-09-09 66.9 154.96 1,931,554 1,912,598 2,857,077 85,985
2 days ago 2026-09-08 67.0 154.98 1,933,274 1,914,318 2,857,077 86,039
1 week ago 2026-09-03 67.3 155.07 1,941,029 1,922,073 2,857,077 86,283
1 month ago 2026-08-10 70.9 156.25 2,044,760 2,025,804 2,857,077 89,582
3 months ago 2026-06-10 71.6 156.48 2,065,442 2,046,486 2,857,077 90,286
6 months ago 2026-03-10 68.6 155.51 1,979,254 1,960,298 2,857,077 87,476
1 year ago 2025-09-10 74.9 157.49 2,158,359 2,139,403 2,857,077 93,714
*

Percent Full is based on Conservation Storage and Conservation Capacity and doesn't account for storage in flood pool.

**

   Values above, including today's are averaged conditions. For near real-time instantaneous water level, see table below or the interactive map viewer.

Most Recent Instantaneous Water Level

Date/time Water Level
(ft) 		Conservation Pool Elevation
(ft) 		Height Above Conservation Pool
(ft)
Most recent 2026-09-10 20:00 154.92 164.40 -9.48 below flood pool
1 hour prior 2026-09-10 19:00 154.92 164.40 -9.48 below flood pool
2 hours prior 2026-09-10 18:00 154.93 164.40 -9.47 below flood pool
6 hours prior 2026-09-10 14:00 154.93 164.40 -9.47 below flood pool
12 hours prior 2026-09-10 08:00 154.94 164.40 -9.46 below flood pool
24 hours prior 2026-09-09 20:00 154.95 164.40 -9.45 below flood pool
48 hours prior 2026-09-08 20:00 154.97 164.40 -9.43 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1965-01-01
Vertical datum NGVD29
Dead pool elevation 105.00 ft above NGVD29
Emergency spillway crest elevation 176.00 ft above NGVD29
Flood pool elevation 173.00 ft above NGVD29
Maximum design elevation 183.00 ft above NGVD29
Top of dam elevation 193.60 ft above NGVD29
Conservation pool elevation 164.40 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1965-01-01 (source: USGS)
2004-04-01 (source: TWDB) : GIS Data
Data Source USGS:08039300
USGS Monitoring Location USGS:08039300

Lake Location