Wright Patman Lake: 97.9% full as of 2023-09-30

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 2023-09-30 97.9 224.83 226,624 226,577 231,496 - n.a. -
1 day prior 2023-09-29 98.7 224.90 228,641 228,594 231,496 - n.a. -
2 days prior 2023-09-28 99.6 224.97 230,672 230,625 231,496 - n.a. -
1 week prior 2023-09-23 99.7 224.98 230,963 230,916 231,496 - n.a. -
1 month prior 2023-08-30 100.0 225.38 242,748 231,496 231,496 - n.a. -
3 months prior 2023-06-30 100.0 229.11 367,694 231,496 231,496 - n.a. -
6 months prior 2023-03-30 100.0 225.50 246,343 122,593 122,593 - n.a. -
1 year prior 2022-09-30 100.0 225.88 257,920 231,496 231,496 - 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 2023-10-01 03:15 224.79 225.00 -0.21 below flood pool
1 hour prior 2023-10-01 02:15 224.79 225.00 -0.21 below flood pool
2 hours prior 2023-10-01 01:15 224.79 225.00 -0.21 below flood pool
6 hours prior 2023-09-30 21:15 224.79 225.00 -0.21 below flood pool
12 hours prior 2023-09-30 15:15 224.82 225.00 -0.18 below flood pool
24 hours prior 2023-09-30 03:15 224.86 225.00 -0.14 below flood pool
48 hours prior 2023-09-29 03:15 224.93 225.00 -0.07 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1954-01-01
Gauge USGS:07344200
Vertical datum NGVD29
Dead pool elevation 200.00 ft above NGVD29
Emergency spillway crest elevation 259.50 ft above NGVD29
Flood pool elevation 259.50 ft above NGVD29
Maximum design elevation 278.90 ft above NGVD29
Top of dam elevation 286.00 ft above NGVD29
Conservation pool elevation
End date: 1990-01-01 		220.00 ft above NGVD29
Conservation pool elevation
Start date to end date: 1990-01-01 to 1990-04-01 		220.60 ft above NGVD29
Conservation pool elevation
Start date: 1990-04-01 (Seasonal: April 1 to June 1) 		227.50 ft above NGVD29
Conservation pool elevation
Start date: 1990-04-01 (Seasonal: June 1 to October 5) 		225.00 ft above NGVD29
Conservation pool elevation
Start date: 1990-04-01 (Seasonal: October 5 to November 1) 		221.20 ft above NGVD29
Conservation pool elevation
Start date: 1990-04-01 (Seasonal: November 1 to April 1) 		220.60 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