Lake Cisco: 42.8% full as of 2026-09-22

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 2026-09-22 42.8 1,503.15 12,404 12,404 29,003 582
Yesterday 2026-09-21 42.8 1,503.16 12,410 12,410 29,003 582
2 days ago 2026-09-20 42.8 1,503.19 12,427 12,427 29,003 583
1 week ago 2026-09-15 43.1 1,503.33 12,509 12,509 29,003 586
1 month ago 2026-08-22 44.4 1,503.97 12,882 12,882 29,003 600
3 months ago 2026-06-22 46.5 1,505.01 13,494 13,494 29,003 624
6 months ago 2026-03-22 47.6 1,505.52 13,799 13,799 29,003 636
1 year ago 2025-09-22 51.4 1,507.21 14,910 14,910 29,003 674
*

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 2026-09-22 20:30 1,503.13 1,522.46 -19.33
1 hour prior 2026-09-22 19:30 1,503.14 1,522.46 -19.32
2 hours prior 2026-09-22 18:30 1,503.13 1,522.46 -19.33
6 hours prior 2026-09-22 14:30 1,503.14 1,522.46 -19.32
12 hours prior 2026-09-22 08:30 1,503.14 1,522.46 -19.32
24 hours prior 2026-09-21 20:30 1,503.15 1,522.46 -19.31
48 hours prior 2026-09-20 20:30 1,503.18 1,522.46 -19.28
*

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