recent changes

2013-02-12: The rating curve for Lake Cisco has been updated and replaced with data from the Texas Water Development Board's Report 126.

Lake Cisco is 100.0% full as of 2016-07-29

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, while 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.

Date Percent Full Mean Water Level
(ft)
Reservoir Storage
(acre-ft)
Conservation Storage
(acre-ft)
Conservation Capacity
(acre-ft)
Surface Area
(acres)
Most recent 2016-07-29 100.0 1,521.27 25,895 25,895 25,895 1,043
1 day prior 2016-07-28 100.0 1,521.28 25,895 25,895 25,895 1,043
2 days prior 2016-07-27 100.0 1,521.30 25,895 25,895 25,895 1,043
1 week prior 2016-07-22 100.0 1,521.43 25,895 25,895 25,895 1,043
1 month prior 2016-06-29 100.0 1,522.12 25,895 25,895 25,895 1,043
3 months prior 2016-04-29 87.7 1,516.51 22,716 22,716 25,895 938
6 months prior 2016-01-29 76.8 1,513.34 19,899 19,899 25,895 829
1 year prior 2015-07-29 73.8 1,512.44 19,106 19,106 25,895 802
*

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 2016-07-30 03:30 1,521.29 1,520.0 1.3 into flood pool
1 hour prior 2016-07-30 02:30 1,521.28 1,520.0 1.3 into flood pool
2 hours prior 2016-07-30 01:30 1,521.29 1,520.0 1.3 into flood pool
6 hours prior 2016-07-29 21:30 1,521.29 1,520.0 1.3 into flood pool
12 hours prior 2016-07-29 15:30 1,521.31 1,520.0 1.3 into flood pool
24 hours prior 2016-07-29 03:30 1,521.26 1,520.0 1.3 into flood pool
48 hours prior 2016-07-28 03:30 1,521.29 1,520.0 1.3 into flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1923-01-01
Vertical datum NGVD29
Gauge USGS:08086215
Service spillway crest elevation 1520 ft above NGVD29
Conservation pool elevation
ending 1929-12-01
1496.0 ft above NGVD29
Conservation pool elevation
starting 1929-12-01
1520.0 ft above NGVD29
Top of dam elevation 1528.5 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1974-10-01 (source: twdb)