Falcon Reservoir: 20.6% full as of 2026-09-19

Lake Falcon straddles the border of Texas and Mexico. By treaty, Texas has rights 58.6% of the total conservation capacity. The fraction of the actual storage that belongs to Texas is formally determined biweekly by the International Boundary Water Commission (IBWC). The IBWC is the legal repository of data related to this lake for treaty purposes and official versions of the datasets should be obtained directly from them. Conservation capacity is based on 58.6% of total conservation capacity. Conservation storage is based on the bi-weekly changing Texas share.

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 2026-09-19 20.6 260.95 451,602 322,245 1,562,367 27,884
Yesterday 2026-09-18 20.7 260.98 452,509 322,892 1,562,367 27,919
2 days ago 2026-09-17 20.7 261.04 454,299 324,169 1,562,367 27,991
1 week ago 2026-09-12 21.4 261.46 466,367 333,995 1,562,367 28,468
1 month ago 2026-08-19 24.3 263.47 525,663 380,284 1,562,367 30,574
3 months ago 2026-06-19 25.8 262.72 502,902 402,792 1,562,367 29,854
6 months ago 2026-03-19 20.5 257.58 364,779 319,948 1,562,367 23,649
1 year ago 2025-09-19 15.7 254.17 290,418 244,856 1,562,367 19,994
*

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 2026-09-19 03:00 260.94 301.20 -40.26 below flood pool
1 hour prior 2026-09-19 02:00 260.94 301.20 -40.26 below flood pool
2 hours prior 2026-09-19 01:00 260.94 301.20 -40.26 below flood pool
6 hours prior 2026-09-18 21:00 260.96 301.20 -40.24 below flood pool
12 hours prior 2026-09-18 15:00 260.97 301.20 -40.23 below flood pool
24 hours prior 2026-09-18 03:00 261.00 301.20 -40.20 below flood pool
48 hours prior 2026-09-17 03:00 261.06 301.20 -40.14 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1954-01-01
Vertical datum NGVD29
Dead pool elevation 204.34 ft above NGVD29
Volume under conservation pool elevation
Start date: 2023-10-01 		2,666,203.00 ac-ft
Volume under conservation pool elevation
End date: 2023-09-30 		2,646,817.00 ac-ft
Dead pool volume 47.00 ac-ft
Top of gate elevation 306.70 ft above NGVD29
Flood pool elevation 306.70 ft above NGVD29
Maximum design elevation 314.20 ft above NGVD29
Top of dam elevation 323.00 ft above NGVD29
Conservation pool elevation
Start date: 2023-10-01 		301.20 ft above NGVD29
Conservation pool elevation
End date: 2023-09-30 		301.10 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

2014-01-01 (source: IBWC)
Data Source IBWC:08-4612.00

Lake Location