Notes

2015-06-17: The elevation for the top of the conservation pool for Lake Granbury has been set to the reservoir's normal maximum operating elevation of 692.7 feet. The calculation for percent full is now based on this elevation.

Lake Granbury: 86.5% full as of 2022-12-08

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, and (2) the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

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 2022-12-08 86.5 690.39 115,954 115,045 132,949 7,330
Yesterday 2022-12-07 86.5 690.38 115,881 114,972 132,949 7,326
2 days ago 2022-12-06 86.4 690.36 115,734 114,825 132,949 7,319
1 week ago 2022-12-01 86.3 690.35 115,661 114,752 132,949 7,315
1 month ago 2022-11-08 85.9 690.27 115,077 114,168 132,949 7,286
3 months ago 2022-09-08 91.3 691.23 122,239 121,330 132,949 7,636
6 months ago 2022-06-08 97.1 692.23 130,058 129,149 132,949 8,001
1 year ago 2021-12-08 97.4 692.28 130,458 129,549 132,949 8,019
*

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 2022-12-08 02:30 690.38 692.70 -2.32 below operating pool
1 hour prior 2022-12-08 01:30 690.39 692.70 -2.31 below operating pool
2 hours prior 2022-12-08 00:30 690.39 692.70 -2.31 below operating pool
6 hours prior 2022-12-07 20:30 690.38 692.70 -2.32 below operating pool
12 hours prior 2022-12-07 14:30 690.39 692.70 -2.31 below operating pool
24 hours prior 2022-12-07 02:30 690.36 692.70 -2.34 below operating pool
48 hours prior 2022-12-06 02:30 690.35 692.70 -2.35 below operating pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1969-01-01
Gauge USGS:08090900
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
Top of flood gate elevation 693.00 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

Lake Location