Lake Cisco: 53.5% full as of 2025-08-17

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 2025-08-17 53.5 1,508.02 15,528 15,528 29,003 693
Yesterday 2025-08-16 53.6 1,508.04 15,543 15,543 29,003 693
2 days ago 2025-08-15 53.7 1,508.07 15,566 15,566 29,003 694
1 week ago 2025-08-10 53.9 1,508.18 15,646 15,646 29,003 697
1 month ago 2025-07-17 55.5 1,508.81 16,108 16,108 29,003 710
3 months ago 2025-05-17 57.0 1,509.35 16,518 16,518 29,003 722
6 months ago 2025-02-17 58.1 1,509.78 16,842 16,842 29,003 733
1 year ago 2024-08-17 55.7 1,508.87 16,152 16,152 29,003 711
*

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 2025-08-17 09:30 1,508.01 1,522.46 -14.45
1 hour prior 2025-08-17 08:30 1,508.01 1,522.46 -14.45
2 hours prior 2025-08-17 07:30 1,508.02 1,522.46 -14.44
6 hours prior 2025-08-17 03:30 1,508.02 1,522.46 -14.44
12 hours prior 2025-08-16 21:30 1,508.02 1,522.46 -14.44
24 hours prior 2025-08-16 09:30 1,508.03 1,522.46 -14.43
48 hours prior 2025-08-15 09:30 1,508.07 1,522.46 -14.39
*

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