recent changes

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: 99.2% full as of 2016-12-06

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, while 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 2016-12-06 99.2 692.57 125,735 124,770 125,756 7,568
Yesterday 2016-12-05 99.1 692.55 125,584 124,619 125,756 7,563
2 days ago 2016-12-04 99.3 692.58 125,811 124,846 125,756 7,571
1 week ago 2016-11-29 99.7 692.65 126,342 125,377 125,756 7,587
1 month ago 2016-11-06 98.6 692.46 124,904 123,939 125,756 7,542
3 months ago 2016-09-06 99.4 692.60 125,962 124,997 125,756 7,575
6 months ago 2016-06-06 93.1 691.53 117,994 117,029 125,756 7,316
1 year ago 2015-12-06 100.0 692.84 127,787 125,756 125,756 7,632
*

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 2016-12-06 05:30 692.59 692.7 -0.1 below flood pool
1 hour prior 2016-12-06 04:30 692.59 692.7 -0.1 below flood pool
2 hours prior 2016-12-06 03:30 692.58 692.7 -0.1 below flood pool
6 hours prior 2016-12-05 23:30 692.57 692.7 -0.1 below flood pool
12 hours prior 2016-12-05 17:30 692.56 692.7 -0.1 below flood pool
24 hours prior 2016-12-05 05:30 692.55 692.7 -0.2 below flood pool
48 hours prior 2016-12-04 05:30 692.60 692.7 -0.1 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1969-01-01
Vertical datum NGVD29
Gauge USGS:08090900
Dead pool elevation 640.0 ft above NGVD29
Service spillway crest elevation 658 ft above NGVD29
Conservation pool elevation 692.7 ft above NGVD29
Top of flood gate elevation 693 ft above NGVD29
Emergency spillway crest elevation 693 ft above NGVD29
Top of dam elevation 706.2 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1969-01-01 (source: usgs)
2003-07-01 (source: twdb) : GIS Data

Lake Location