Amistad Reservoir: 48.5% full as of 2022-01-19

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 2022-01-19 48.5 1,069.00 1,104,015 893,726 1,840,849 28,263
Yesterday 2022-01-18 48.6 1,069.00 1,104,038 893,745 1,840,849 28,264
2 days ago 2022-01-17 48.6 1,069.02 1,104,681 894,266 1,840,849 28,278
1 week ago 2022-01-12 48.8 1,069.07 1,106,181 898,167 1,840,849 28,313
1 month ago 2021-12-19 49.3 1,069.37 1,114,471 907,278 1,840,849 28,506
3 months ago 2021-10-19 51.5 1,070.47 1,145,614 948,233 1,840,849 29,221
6 months ago 2021-07-19 53.0 1,069.66 1,122,495 975,296 1,840,849 28,690
1 year ago 2021-01-19 63.7 1,073.71 1,241,794 1,172,039 1,840,849 31,394
*

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 2022-01-19 09:45 1,069.01 1,117.00 -47.99 below flood pool
1 hour prior 2022-01-19 08:45 1,069.01 1,117.00 -47.99 below flood pool
2 hours prior 2022-01-19 07:45 1,069.00 1,117.00 -48.00 below flood pool
6 hours prior 2022-01-19 03:45 1,068.99 1,117.00 -48.01 below flood pool
12 hours prior 2022-01-18 21:45 - n.a. - - n.a. - - n.a. - into flood pool
24 hours prior 2022-01-18 09:45 1,068.99 1,117.00 -48.01 below flood pool
48 hours prior 2022-01-17 09:45 1,069.02 1,117.00 -47.98 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1969-01-01
Vertical datum NGVD29
Gauge IBWC:08-4508.00
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