Lake Houston: 99.2% full as of 2026-08-20

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 2026-08-20 99.2 42.29 135,091 131,290 132,318 11,403
Yesterday 2026-08-19 99.1 42.28 134,977 131,176 132,318 11,398
2 days ago 2026-08-18 99.3 42.30 135,205 131,404 132,318 11,407
1 week ago 2026-08-13 99.8 42.36 135,891 132,090 132,318 11,434
1 month ago 2026-07-20 98.4 42.20 134,067 130,266 132,318 11,363
3 months ago 2026-05-20 92.4 41.49 126,110 122,309 132,318 11,049
6 months ago 2026-02-20 100.0 42.56 138,187 132,318 132,318 - n.a. -
1 year ago 2025-08-20 100.0 42.61 138,763 132,318 132,318 - 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 2026-08-20 14:30 42.23 42.38 -0.15
1 hour prior 2026-08-20 13:30 42.26 42.38 -0.12
2 hours prior 2026-08-20 12:30 42.27 42.38 -0.11
6 hours prior 2026-08-20 08:30 42.29 42.38 -0.09
12 hours prior 2026-08-20 02:30 42.32 42.38 -0.06
24 hours prior 2026-08-19 14:30 42.25 42.38 -0.13
48 hours prior 2026-08-18 14:30 42.26 42.38 -0.12
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1954-01-01
Vertical datum NAVD88
Dead pool elevation 19.23 ft above NAVD88
Service spillway crest elevation 42.38 ft above NAVD88
Top of 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
Start date: 2011-12-01 		42.38 ft above NAVD88
Conservation pool elevation
End date: 2011-12-01 		41.73 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
Data Source USGS:08072000
USGS Monitoring Location USGS:08072000

Lake Location