Amistad Reservoir: 25.8% full as of 2025-04-03

Lake Amistad straddles the border of Texas and Mexico. By treaty, Texas has rights 56.2% 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 56.2% of total conservation capacity. Conservation storage is based on the bi-weekly changing Texas fraction.

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 2025-04-03 25.8 1,050.77 663,729 468,673 1,813,408 17,907
1 day prior 2025-04-02 25.8 1,050.77 663,717 468,761 1,813,408 17,906
2 days prior 2025-04-01 25.8 1,050.76 663,576 468,661 1,813,408 17,903
1 week prior 2025-03-27 25.8 1,050.76 663,623 468,694 1,813,408 17,904
1 month prior 2025-03-03 26.2 1,051.16 670,954 474,668 1,813,408 18,100
3 months prior 2025-01-03 26.5 1,051.19 671,356 479,937 1,813,408 18,111
6 months prior 2024-10-03 27.0 1,051.42 675,626 489,549 1,813,408 18,226
1 year prior 2024-04-03 28.2 1,050.91 666,271 511,676 1,813,408 17,975
*

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 2025-04-03 21:15 1,050.75 1,117.00 -66.25 below flood pool
1 hour prior 2025-04-03 20:15 1,050.76 1,117.00 -66.24 below flood pool
2 hours prior 2025-04-03 19:15 1,050.76 1,117.00 -66.24 below flood pool
6 hours prior 2025-04-03 15:15 1,050.76 1,117.00 -66.24 below flood pool
12 hours prior 2025-04-03 09:15 1,050.77 1,117.00 -66.23 below flood pool
24 hours prior 2025-04-02 21:15 1,050.75 1,117.00 -66.25 below flood pool
48 hours prior 2025-04-01 21:15 1,050.75 1,117.00 -66.25 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1969-01-01
Vertical datum NGVD29
Dead pool elevation 930.00 ft above NGVD29
Volume under conservation pool elevation
Start date: 2023-10-01 		3,226,704.00 ac-ft
Volume under conservation pool elevation
End date: 2023-09-30 		3,275,532.00 ac-ft
Top of flood gate elevation 1,140.40 ft above NGVD29
Flood pool elevation 1,140.40 ft above NGVD29
Maximum design elevation 1,145.12 ft above NGVD29
Top of dam elevation 1,152.30 ft above NGVD29
Conservation pool elevation 1,117.00 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:08-4508.00

Lake Location