Pat Mayse Lake: 88.2% full as of 2024-11-20

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 2024-11-20 88.2 448.56 104,482 100,322 113,683 5,274
1 day prior 2024-11-19 88.3 448.57 104,535 100,375 113,683 5,276
2 days prior 2024-11-18 88.3 448.57 104,535 100,375 113,683 5,276
1 week prior 2024-11-13 88.2 448.56 104,482 100,322 113,683 5,274
1 month prior 2024-10-20 89.0 448.73 105,381 101,221 113,683 5,296
3 months prior 2024-08-20 96.7 450.32 114,035 109,875 113,683 5,564
6 months prior 2024-05-20 100.0 452.73 127,759 113,683 113,683 - n.a. -
1 year prior 2023-11-20 92.2 449.41 109,015 104,855 113,683 5,406
*

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 2024-11-20 23:00 448.54 451.00 -2.46 below flood pool
1 hour prior 2024-11-20 22:00 448.54 451.00 -2.46 below flood pool
2 hours prior 2024-11-20 21:00 448.54 451.00 -2.46 below flood pool
6 hours prior 2024-11-20 17:00 448.55 451.00 -2.45 below flood pool
12 hours prior 2024-11-20 11:00 448.56 451.00 -2.44 below flood pool
24 hours prior 2024-11-19 23:00 448.57 451.00 -2.43 below flood pool
48 hours prior 2024-11-18 23:00 448.58 451.00 -2.42 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1967-01-01
Vertical datum NGVD29
Dead pool elevation 415.00 ft above NGVD29
Service spillway crest elevation 451.00 ft above NGVD29
Emergency spillway crest elevation 477.00 ft above NGVD29
Flood pool elevation 460.50 ft above NGVD29
Top of dam elevation 488.50 ft above NGVD29
Conservation pool elevation 451.00 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1967-01-01 (source: USGS)
2008-07-01 (source: TWDB) : GIS Data
Data Source USGS:07335390
Data Source USACE:MYST2
Data Source USGS:07335390

Lake Location