Lake Cisco: 50.8% full as of 2025-10-07

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 2025-10-07 50.8 1,506.94 14,720 14,720 29,003 668
1 day prior 2025-10-06 50.8 1,506.96 14,733 14,733 29,003 668
2 days prior 2025-10-05 50.8 1,506.98 14,747 14,747 29,003 669
1 week prior 2025-09-30 51.1 1,507.10 14,831 14,831 29,003 672
1 month prior 2025-09-07 52.4 1,507.58 15,191 15,191 29,003 683
3 months prior 2025-07-07 56.0 1,509.01 16,256 16,256 29,003 714
6 months prior 2025-04-07 56.8 1,509.31 16,487 16,487 29,003 721
1 year prior 2024-10-07 55.5 1,508.78 16,086 16,086 29,003 710
*

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 2025-10-07 23:30 1,506.93 1,522.46 -15.53
1 hour prior 2025-10-07 22:30 1,506.93 1,522.46 -15.53
2 hours prior 2025-10-07 21:30 1,506.93 1,522.46 -15.53
6 hours prior 2025-10-07 17:30 1,506.94 1,522.46 -15.52
12 hours prior 2025-10-07 11:30 1,506.95 1,522.46 -15.51
24 hours prior 2025-10-06 23:30 1,506.95 1,522.46 -15.51
48 hours prior 2025-10-05 23:30 1,506.97 1,522.46 -15.49
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1923-01-01
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
Start date: 1929-12-01
1,522.46 ft above NGVD29
Conservation pool elevation
End date: 1929-12-01
1,496.00 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1974-10-01 (source: TWDB)
Data Source USGS:08086215

Lake Location