Recent changes

2013-06-19: The vertical datum of the 1998 TWDB rating curve for Lake Graham has been adjusted from NGVD29 to NGVD29+1.3ft.

Lake Graham: 99.1% full as of 2017-07-21

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 2017-07-21 99.1 1,074.83 44,883 44,869 45,288 2,432
Yesterday 2017-07-20 99.2 1,074.86 44,957 44,943 45,288 2,434
2 days ago 2017-07-19 99.4 1,074.89 45,031 45,017 45,288 2,436
1 week ago 2017-07-14 99.9 1,074.99 45,278 45,264 45,288 2,443
1 month ago 2017-06-21 100.0 1,075.00 45,302 45,288 45,288 - n.a. -
3 months ago 2017-04-21 98.8 1,074.78 44,760 44,746 45,288 2,429
6 months ago 2017-01-21 100.0 1,075.43 46,373 45,288 45,288 - n.a. -
1 year ago 2016-07-21 96.4 1,074.33 43,660 43,646 45,288 2,398
*

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 2017-07-21 23:00 1,074.81 1,075.0 -0.2 below flood pool
1 hour prior 2017-07-21 22:00 1,074.81 1,075.0 -0.2 below flood pool
2 hours prior 2017-07-21 21:00 1,074.81 1,075.0 -0.2 below flood pool
6 hours prior 2017-07-21 17:00 1,074.82 1,075.0 -0.2 below flood pool
12 hours prior 2017-07-21 11:00 1,074.82 1,075.0 -0.2 below flood pool
24 hours prior 2017-07-20 23:00 1,074.84 1,075.0 -0.2 below flood pool
48 hours prior 2017-07-19 23:00 - n.a. - - n.a. - - n.a. - into flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1958-01-01
Vertical datum NGVD29 +1.3
Gauge USGS:08088400
Dead pool elevation 1030.0 ft above NGVD29 +1.3
Service spillway crest elevation 1076.3 ft above NGVD29
Conservation pool elevation 1075.0 ft above NGVD29 +1.3
Top of dam elevation 1093.3 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1958-01-01 (source: usgs)
1998-04-01 (source: twdb) : GIS Data

Lake Location