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: 85.5% full as of 2018-07-23

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 2018-07-23 85.5 1,072.24 38,733 38,719 45,288 2,255
Yesterday 2018-07-22 85.5 1,072.25 38,756 38,742 45,288 2,255
2 days ago 2018-07-21 85.7 1,072.28 38,825 38,811 45,288 2,258
1 week ago 2018-07-16 86.6 1,072.45 39,215 39,201 45,288 2,269
1 month ago 2018-06-23 89.7 1,073.06 40,631 40,617 45,288 2,311
3 months ago 2018-04-23 94.7 1,074.02 42,910 42,896 45,288 2,377
6 months ago 2018-01-23 94.1 1,073.91 42,646 42,632 45,288 2,369
1 year ago 2017-07-23 98.6 1,074.75 44,686 44,672 45,288 2,427
*

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 2018-07-23 08:00 1,072.22 1,075.0 -2.8 below flood pool
1 hour prior 2018-07-23 07:00 1,072.24 1,075.0 -2.8 below flood pool
2 hours prior 2018-07-23 06:00 1,072.23 1,075.0 -2.8 below flood pool
6 hours prior 2018-07-23 02:00 1,072.24 1,075.0 -2.8 below flood pool
12 hours prior 2018-07-22 20:00 1,072.24 1,075.0 -2.8 below flood pool
24 hours prior 2018-07-22 08:00 1,072.26 1,075.0 -2.7 below flood pool
48 hours prior 2018-07-21 08:00 1,072.28 1,075.0 -2.7 below 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 1,030.0 ft above NGVD29 +1.3
Service spillway crest elevation 1,076.3 ft above NGVD29
Top of dam elevation 1,093.3 ft above NGVD29
Conservation pool elevation 1,075.0 ft above NGVD29 +1.3
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