Wright Patman Lake: 100.0% full as of 2017-11-18

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 2017-11-18 100.0 224.02 203,952 122,593 122,593 - n.a. -
1 day prior 2017-11-17 100.0 223.98 202,866 122,593 122,593 - n.a. -
2 days prior 2017-11-16 100.0 223.96 202,325 122,593 122,593 - n.a. -
1 week prior 2017-11-11 100.0 223.98 202,866 122,593 122,593 - n.a. -
1 month prior 2017-10-18 100.0 224.60 220,054 135,069 135,069 - n.a. -
3 months prior 2017-08-18 100.0 227.01 294,006 231,496 231,496 - n.a. -
6 months prior 2017-05-18 94.0 226.94 291,699 291,652 310,382 - n.a. -
1 year prior 2016-11-18 100.0 223.90 200,701 122,593 122,593 - 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 2017-11-18 09:00 224.08 220.6 3.5 into flood pool
1 hour prior 2017-11-18 08:00 224.04 220.6 3.4 into flood pool
2 hours prior 2017-11-18 07:00 224.04 220.6 3.4 into flood pool
6 hours prior 2017-11-18 03:00 224.01 220.6 3.4 into flood pool
12 hours prior 2017-11-17 21:00 223.98 220.6 3.4 into flood pool
24 hours prior 2017-11-17 09:00 223.99 220.6 3.4 into flood pool
48 hours prior 2017-11-16 09:00 223.96 220.6 3.4 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