Lake Cisco: 43.0% full as of 2026-09-16

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 2026-09-16 43.0 1,503.29 12,485 12,485 29,003 585
1 day prior 2026-09-15 43.1 1,503.33 12,509 12,509 29,003 586
2 days prior 2026-09-14 43.2 1,503.36 12,526 12,526 29,003 587
1 week prior 2026-09-09 43.4 1,503.46 12,585 12,585 29,003 589
1 month prior 2026-08-16 44.8 1,504.15 12,986 12,986 29,003 605
3 months prior 2026-06-16 46.5 1,505.00 13,488 13,488 29,003 624
6 months prior 2026-03-16 47.8 1,505.63 13,868 13,868 29,003 639
1 year prior 2025-09-16 51.7 1,507.34 15,008 15,008 29,003 677
*

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 2026-09-17 03:30 1,503.27 1,522.46 -19.19
1 hour prior 2026-09-17 02:30 1,503.26 1,522.46 -19.20
2 hours prior 2026-09-17 01:30 1,503.27 1,522.46 -19.19
6 hours prior 2026-09-16 21:30 1,503.27 1,522.46 -19.19
12 hours prior 2026-09-16 15:30 1,503.30 1,522.46 -19.16
24 hours prior 2026-09-16 03:30 1,503.30 1,522.46 -19.16
48 hours prior 2026-09-15 03:30 1,503.34 1,522.46 -19.12
*

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