Lake Cisco: 43.5% full as of 2026-09-05

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 2026-09-05 43.5 1,503.50 12,608 12,608 29,003 590
1 day prior 2026-09-04 43.5 1,503.53 12,626 12,626 29,003 591
2 days prior 2026-09-03 43.6 1,503.56 12,643 12,643 29,003 591
1 week prior 2026-08-29 43.9 1,503.71 12,731 12,731 29,003 595
1 month prior 2026-08-05 44.8 1,504.18 13,003 13,003 29,003 606
3 months prior 2026-06-05 46.8 1,505.14 13,570 13,570 29,003 627
6 months prior 2026-03-05 47.7 1,505.57 13,830 13,830 29,003 637
1 year prior 2025-09-05 52.5 1,507.64 15,237 15,237 29,003 684
*

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 2026-09-05 23:30 1,503.48 1,522.46 -18.98
1 hour prior 2026-09-05 22:30 1,503.48 1,522.46 -18.98
2 hours prior 2026-09-05 21:30 1,503.48 1,522.46 -18.98
6 hours prior 2026-09-05 17:30 1,503.51 1,522.46 -18.95
12 hours prior 2026-09-05 11:30 1,503.52 1,522.46 -18.94
24 hours prior 2026-09-04 23:30 1,503.51 1,522.46 -18.95
48 hours prior 2026-09-03 23:30 1,503.53 1,522.46 -18.93
*

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