Amistad Reservoir: 47.2% full as of 2023-02-06

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)
Today 2023-02-06 47.2 1,081.50 1,502,773 868,791 1,840,849 37,032
Yesterday 2023-02-05 47.3 1,081.57 1,505,467 870,348 1,840,849 37,089
2 days ago 2023-02-04 47.3 1,081.56 1,504,919 870,031 1,840,849 37,078
1 week ago 2023-01-30 47.3 1,081.56 1,504,961 870,652 1,840,849 37,079
1 month ago 2023-01-06 47.0 1,081.31 1,495,868 866,029 1,840,849 36,889
3 months ago 2022-11-06 46.3 1,080.09 1,452,014 851,740 1,840,849 35,969
6 months ago 2022-08-06 31.2 1,053.31 737,534 574,517 1,840,849 19,388
1 year ago 2022-02-06 48.2 1,068.91 1,101,549 887,404 1,840,849 28,205
*

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 2023-02-06 09:45 1,081.46 1,117.00 -35.54 below flood pool
1 hour prior 2023-02-06 08:45 1,081.48 1,117.00 -35.52 below flood pool
2 hours prior 2023-02-06 07:45 1,081.50 1,117.00 -35.50 below flood pool
6 hours prior 2023-02-06 03:45 1,081.51 1,117.00 -35.49 below flood pool
12 hours prior 2023-02-05 21:45 - n.a. - - n.a. - - n.a. - into flood pool
24 hours prior 2023-02-05 09:45 1,081.56 1,117.00 -35.44 below flood pool
48 hours prior 2023-02-04 09:45 1,081.56 1,117.00 -35.44 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1969-01-01
Gauge IBWC:08-4508.00
Vertical datum NGVD29
Dead pool elevation 930.00 ft above NGVD29
Service spillway crest elevation 1,086.40 ft above NGVD29
Volume under conservation pool elevation 3,275,532.00 ac-ft
Top of flood gate elevation 1,140.40 ft above NGVD29
Emergency spillway crest 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

Lake Location