Falcon Reservoir: 16.3% full as of 2025-09-26

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)
Most recent 2025-09-26 16.3 254.52 297,688 254,428 1,562,367 20,347
1 day prior 2025-09-25 16.0 254.25 292,073 249,628 1,562,367 20,070
2 days prior 2025-09-24 15.9 254.19 290,773 248,517 1,562,367 20,010
1 week prior 2025-09-19 15.7 254.17 290,418 244,856 1,562,367 19,994
1 month prior 2025-08-26 15.3 254.13 289,628 238,558 1,562,367 19,958
3 months prior 2025-06-26 15.2 254.97 307,114 237,348 1,562,367 20,813
6 months prior 2025-03-26 14.6 254.70 301,323 227,848 1,562,367 20,527
1 year prior 2024-09-26 14.1 255.96 327,842 219,620 1,562,367 21,840
*

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 2025-09-26 22:00 254.78 301.20 -46.42
1 hour prior 2025-09-26 21:00 254.77 301.20 -46.43
2 hours prior 2025-09-26 20:00 254.77 301.20 -46.43
6 hours prior 2025-09-26 16:00 254.71 301.20 -46.49
12 hours prior 2025-09-26 10:00 254.57 301.20 -46.63
24 hours prior 2025-09-25 22:00 254.30 301.20 -46.90
48 hours prior 2025-09-24 22:00 254.19 301.20 -47.01
*

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
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