Wright Patman Lake: 100.0% full as of 2018-09-21

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, 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)
Most recent 2018-09-21 100.0 225.38 242,748 231,496 231,496 - n.a. -
1 day prior 2018-09-20 100.0 225.40 243,344 231,496 231,496 - n.a. -
2 days prior 2018-09-19 100.0 225.43 244,244 231,496 231,496 - n.a. -
1 week prior 2018-09-14 100.0 225.51 246,645 231,496 231,496 - n.a. -
1 month prior 2018-08-21 100.0 225.93 259,464 231,496 231,496 - n.a. -
3 months prior 2018-06-21 100.0 227.21 300,652 231,496 231,496 - n.a. -
6 months prior 2018-03-21 100.0 246.67 1,321,051 122,593 122,593 - n.a. -
1 year prior 2017-09-21 100.0 225.27 239,476 231,496 231,496 - 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 2018-09-21 23:00 225.37 225.0 0.4 into flood pool
1 hour prior 2018-09-21 22:00 225.37 225.0 0.4 into flood pool
2 hours prior 2018-09-21 21:00 225.37 225.0 0.4 into flood pool
6 hours prior 2018-09-21 17:00 225.36 225.0 0.4 into flood pool
12 hours prior 2018-09-21 11:00 225.37 225.0 0.4 into flood pool
24 hours prior 2018-09-20 23:00 225.38 225.0 0.4 into flood pool
48 hours prior 2018-09-19 23:00 225.46 225.0 0.5 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