Notes

2019-05-08: The conservation pool elevation for Lake Houston has been updated to reflect the current surveyed effective elevation of the top of the spillway crest, which is the reservoir's normal operating level. The 2011 TWDB rating curve has been updated using improved volumetric calculation methodologies (TWDB, 2018).

Lake Houston: 97.3% full as of 2022-10-02

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)
Today 2022-10-02 97.3 42.07 132,593 128,792 132,318 11,306
Yesterday 2022-10-01 97.3 42.07 132,593 128,792 132,318 11,306
2 days ago 2022-09-30 97.2 42.06 132,480 128,679 132,318 11,301
1 week ago 2022-09-25 98.9 42.25 134,636 130,835 132,318 11,385
1 month ago 2022-09-02 100.0 42.68 139,572 132,318 132,318 - n.a. -
3 months ago 2022-07-02 98.2 42.17 133,726 129,925 132,318 11,350
6 months ago 2022-04-02 100.0 42.62 138,879 132,318 132,318 - n.a. -
1 year ago 2021-10-02 100.0 43.15 145,062 132,318 132,318 - 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 2022-10-02 09:30 42.06 42.38 -0.32
1 hour prior 2022-10-02 08:30 42.01 42.38 -0.37
2 hours prior 2022-10-02 07:30 42.04 42.38 -0.34
6 hours prior 2022-10-02 03:30 42.06 42.38 -0.32
12 hours prior 2022-10-01 21:30 42.09 42.38 -0.29
24 hours prior 2022-10-01 09:30 42.07 42.38 -0.31
48 hours prior 2022-09-30 09:30 42.05 42.38 -0.33
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1954-01-01
Gauge USGS:08072000
Vertical datum NAVD88
Dead pool elevation 19.23 ft above NAVD88
Service spillway crest elevation 42.38 ft above NAVD88
Top of flood gate elevation 45.73 ft above NAVD88
Emergency spillway crest elevation 42.38 ft above NAVD88
Maximum design elevation 54.23 ft above NAVD88
Top of dam elevation 60.23 ft above NAVD88
Conservation pool elevation
End date: 2011-12-01
41.73 ft above NAVD88
Conservation pool elevation
Start date: 2011-12-01
42.38 ft above NAVD88
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1994-02-01 (source: TWDB) : GIS Data
2011-12-01 (source: TWDB) : GIS Data
2018-06-01 (source: TWDB) : GIS Data

Lake Location