Notes

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: 69.5% full as of 2023-05-28

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 2023-05-28 69.5 1,513.63 20,153 20,153 29,003 839
Yesterday 2023-05-27 69.5 1,513.64 20,162 20,162 29,003 839
2 days ago 2023-05-26 69.6 1,513.66 20,179 20,179 29,003 840
1 week ago 2023-05-21 69.0 1,513.48 20,021 20,021 29,003 833
1 month ago 2023-04-28 69.2 1,513.52 20,056 20,056 29,003 835
3 months ago 2023-02-28 70.7 1,514.03 20,510 20,510 29,003 852
6 months ago 2022-11-28 72.1 1,514.46 20,897 20,897 29,003 866
1 year ago 2022-05-28 82.0 1,517.67 23,769 23,769 29,003 974
*

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 2023-05-28 11:30 1,513.63 1,522.46 -8.83
1 hour prior 2023-05-28 10:30 1,513.63 1,522.46 -8.83
2 hours prior 2023-05-28 09:30 1,513.63 1,522.46 -8.83
6 hours prior 2023-05-28 05:30 1,513.63 1,522.46 -8.83
12 hours prior 2023-05-27 23:30 1,513.64 1,522.46 -8.82
24 hours prior 2023-05-27 11:30 1,513.61 1,522.46 -8.85
48 hours prior 2023-05-26 11:30 1,513.66 1,522.46 -8.80
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1923-01-01
Gauge USGS:08086215
Vertical datum NGVD29
Service spillway crest elevation 1,522.46 ft above NGVD29
Top of dam elevation 1,528.50 ft above NGVD29
Conservation pool elevation
End date: 1929-12-01 		1,496.00 ft above NGVD29
Conservation pool elevation
Start date: 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