Wright Patman Lake: 100.0% full as of 2017-09-23

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 2017-09-23 100.0 225.25 238,884 231,496 231,496 - n.a. -
Yesterday 2017-09-22 100.0 225.26 239,180 231,496 231,496 - n.a. -
2 days ago 2017-09-21 100.0 225.29 240,069 231,496 231,496 - n.a. -
1 week ago 2017-09-16 100.0 225.49 246,043 231,496 231,496 - n.a. -
1 month ago 2017-08-23 100.0 228.92 360,673 231,496 231,496 - n.a. -
3 months ago 2017-06-23 100.0 227.67 316,238 231,496 231,496 - n.a. -
6 months ago 2017-03-23 100.0 224.06 205,043 122,593 122,593 - n.a. -
1 year ago 2016-09-23 100.0 225.61 249,666 231,496 231,496 - n.a. -
*

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 2017-09-23 07:00 225.24 225.0 0.2 into flood pool
1 hour prior 2017-09-23 06:00 225.24 225.0 0.2 into flood pool
2 hours prior 2017-09-23 05:00 225.25 225.0 0.2 into flood pool
6 hours prior 2017-09-23 01:00 225.25 225.0 0.2 into flood pool
12 hours prior 2017-09-22 19:00 225.25 225.0 0.2 into flood pool
24 hours prior 2017-09-22 07:00 225.27 225.0 0.3 into flood pool
48 hours prior 2017-09-21 07:00 225.30 225.0 0.3 into flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1954-01-01
Vertical datum NGVD29
Gauge USGS:07344200
Dead pool elevation 200.0 ft above NGVD29
Emergency spillway crest elevation 259.5 ft above NGVD29
Flood pool elevation 259.5 ft above NGVD29
Maximum design elevation 278.9 ft above NGVD29
Top of dam elevation 286.0 ft above NGVD29
Conservation pool elevation
ending 1990-01-01
220.0 ft above NGVD29
Conservation pool elevation
1990-01-01 to 1990-04-01
220.6 ft above NGVD29
Conservation pool elevation
seasonal: April 1 to June 1 starting 1990-04-01
227.5 ft above NGVD29
Conservation pool elevation
seasonal: June 1 to October 5 starting 1990-04-01
225.0 ft above NGVD29
Conservation pool elevation
seasonal: October 5 to November 1 starting 1990-04-01
221.2 ft above NGVD29
Conservation pool elevation
seasonal: November 1 to April 1 starting 1990-04-01
220.6 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1997-01-01 (source: twdb) : GIS Data

Lake Location