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: 83.2% full as of 2020-09-20

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)
Today 2020-09-20 83.2 1,518.06 24,139 24,139 29,003 985
Yesterday 2020-09-19 83.3 1,518.08 24,157 24,157 29,003 985
2 days ago 2020-09-18 83.3 1,518.09 24,167 24,167 29,003 986
1 week ago 2020-09-13 83.5 1,518.16 24,232 24,232 29,003 988
1 month ago 2020-08-20 81.4 1,517.50 23,604 23,604 29,003 969
3 months ago 2020-06-20 86.1 1,518.96 24,979 24,979 29,003 1,009
6 months ago 2020-03-20 89.7 1,520.03 26,030 26,030 29,003 - n.a. -
1 year ago 2019-09-20 90.7 1,520.29 26,309 26,309 29,003 - 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 2020-09-20 14:30 1,518.06 1,522.46 -4.40 below flood pool
1 hour prior 2020-09-20 13:30 1,518.06 1,522.46 -4.40 below flood pool
2 hours prior 2020-09-20 12:30 1,518.06 1,522.46 -4.40 below flood pool
6 hours prior 2020-09-20 08:30 1,518.06 1,522.46 -4.40 below flood pool
12 hours prior 2020-09-20 02:30 1,518.07 1,522.46 -4.39 below flood pool
24 hours prior 2020-09-19 14:30 1,518.08 1,522.46 -4.38 below flood pool
48 hours prior 2020-09-18 14:30 1,518.09 1,522.46 -4.37 below 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 1,522.46 ft above NGVD29
Top of dam elevation 1,528.50 ft above NGVD29
Conservation pool elevation
ending 1929-12-01
1,496.00 ft above NGVD29
Conservation pool elevation
starting 1929-12-01
1,522.46 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1974-10-01 (source: twdb)

Lake Location