Lake Granbury: 86.4% full as of 2026-09-17

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 2026-09-17 86.4 690.37 115,807 114,898 132,949 7,322
Yesterday 2026-09-16 86.5 690.38 115,881 114,972 132,949 7,326
2 days ago 2026-09-15 86.6 690.41 116,100 115,191 132,949 7,337
1 week ago 2026-09-10 87.5 690.56 117,205 116,296 132,949 7,392
1 month ago 2026-08-17 90.7 691.13 121,478 120,569 132,949 7,599
3 months ago 2026-06-17 98.9 692.52 132,393 131,484 132,949 8,107
6 months ago 2026-03-17 98.7 692.49 132,150 131,241 132,949 8,096
1 year ago 2025-09-17 95.8 692.00 128,227 127,318 132,949 7,917
*

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 2026-09-17 03:45 690.37 692.70 -2.33 below operating pool
1 hour prior 2026-09-17 02:45 690.37 692.70 -2.33 below operating pool
2 hours prior 2026-09-17 01:45 690.36 692.70 -2.34 below operating pool
6 hours prior 2026-09-16 21:45 690.38 692.70 -2.32 below operating pool
12 hours prior 2026-09-16 15:45 690.37 692.70 -2.33 below operating pool
24 hours prior 2026-09-16 03:45 690.40 692.70 -2.30 below operating pool
48 hours prior 2026-09-15 03:45 690.42 692.70 -2.28 below operating pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1969-01-01
Vertical datum NGVD29 -1.11
Dead pool elevation 640.00 ft above NGVD29 -1.11
Service spillway crest elevation 658.00 ft above NGVD29 -1.11
Emergency spillway crest elevation 693.00 ft above NGVD29 -1.11
Top of dam elevation 706.50 ft above NGVD29 -1.11
Conservation pool elevation 692.70 ft above NGVD29 -1.11
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1969-01-01 (source: TWDB)
1993-10-01 (source: TWDB) : GIS Data
2003-07-01 (source: TWDB) : GIS Data
2015-06-01 (source: TWDB) : GIS Data
Data Source USGS:08090900
USGS Monitoring Location USGS:08090900

Lake Location