Wright Patman Lake: 100.0% full as of 2026-09-21

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 2026-09-21 100.0 225.52 246,947 122,593 122,593 - n.a. -
1 day prior 2026-09-20 100.0 225.54 247,551 122,593 122,593 - n.a. -
2 days prior 2026-09-19 100.0 225.56 248,154 122,593 122,593 - n.a. -
1 week prior 2026-09-14 100.0 225.69 252,096 122,593 122,593 - n.a. -
1 month prior 2026-08-21 100.0 226.28 270,409 122,593 122,593 - n.a. -
3 months prior 2026-06-21 100.0 227.90 324,183 122,593 122,593 - n.a. -
6 months prior 2026-03-21 100.0 223.76 196,948 122,593 122,593 - n.a. -
1 year prior 2025-09-21 100.0 225.25 238,884 122,593 122,593 - 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 2026-09-21 23:15 225.52 220.60 4.92 into flood pool
1 hour prior 2026-09-21 22:15 225.50 220.60 4.90 into flood pool
2 hours prior 2026-09-21 21:15 225.50 220.60 4.90 into flood pool
6 hours prior 2026-09-21 17:15 225.57 220.60 4.97 into flood pool
12 hours prior 2026-09-21 11:15 225.54 220.60 4.94 into flood pool
24 hours prior 2026-09-20 23:15 225.53 220.60 4.93 into flood pool
48 hours prior 2026-09-19 23:15 225.55 220.60 4.95 into flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1954-01-01
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
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
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
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1997-01-01 (source: TWDB) : GIS Data
Data Source USGS:07344200
USGS Monitoring Location USGS:07344200

Lake Location