Lake Cisco: 43.4% full as of 2026-09-07

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 2026-09-07 43.4 1,503.45 12,579 12,579 29,003 589
Yesterday 2026-09-06 43.4 1,503.47 12,591 12,591 29,003 589
2 days ago 2026-09-05 43.5 1,503.50 12,608 12,608 29,003 590
1 week ago 2026-08-31 43.8 1,503.64 12,690 12,690 29,003 593
1 month ago 2026-08-07 44.7 1,504.12 12,969 12,969 29,003 604
3 months ago 2026-06-07 46.9 1,505.19 13,599 13,599 29,003 629
6 months ago 2026-03-07 47.8 1,505.64 13,874 13,874 29,003 639
1 year ago 2025-09-07 52.4 1,507.58 15,191 15,191 29,003 683
*

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 2026-09-07 03:30 1,503.45 1,522.46 -19.01
1 hour prior 2026-09-07 02:30 1,503.45 1,522.46 -19.01
2 hours prior 2026-09-07 01:30 1,503.45 1,522.46 -19.01
6 hours prior 2026-09-06 21:30 1,503.46 1,522.46 -19.00
12 hours prior 2026-09-06 15:30 1,503.47 1,522.46 -18.99
24 hours prior 2026-09-06 03:30 1,503.47 1,522.46 -18.99
48 hours prior 2026-09-05 03:30 1,503.50 1,522.46 -18.96
*

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
USGS Monitoring Location USGS:08086215

Lake Location