Recent changes

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: 92.2% full as of 2019-08-21

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 2019-08-21 92.2 41.46 123,965 119,990 130,147 10,798
1 day prior 2019-08-20 91.9 41.42 123,533 119,558 130,147 10,777
2 days prior 2019-08-19 92.2 41.46 123,965 119,990 130,147 10,798
1 week prior 2019-08-14 93.2 41.58 125,265 121,290 130,147 10,862
1 month prior 2019-07-21 92.9 41.55 124,939 120,964 130,147 10,846
3 months prior 2019-05-21 96.4 41.96 129,430 125,455 130,147 11,061
6 months prior 2019-02-21 100.0 42.48 135,253 130,147 130,147 - n.a. -
1 year prior 2018-08-21 100.0 42.47 135,140 130,147 130,147 - 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 2019-08-21 22:30 41.49 42.38 -0.89 below flood pool
1 hour prior 2019-08-21 21:30 41.48 42.38 -0.90 below flood pool
2 hours prior 2019-08-21 20:30 41.47 42.38 -0.91 below flood pool
6 hours prior 2019-08-21 16:30 41.44 42.38 -0.94 below flood pool
12 hours prior 2019-08-21 10:30 41.44 42.38 -0.94 below flood pool
24 hours prior 2019-08-20 22:30 41.46 42.38 -0.92 below flood pool
48 hours prior 2019-08-19 22:30 41.45 42.38 -0.93 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1954-01-01
Vertical datum NAVD88
Gauge USGS:08072000
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
ending 2011-12-01
41.73 ft above NAVD88
Conservation pool elevation
starting 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

Lake Location