Amistad Reservoir: 82.4% full as of 2017-02-21

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. The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, while the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

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 2017-02-21 82.4 1,096.63 2,137,819 1,516,247 1,840,849 48,639
Yesterday 2017-02-20 82.4 1,096.66 2,138,939 1,517,041 1,840,849 48,657
2 days ago 2017-02-19 82.4 1,096.65 2,138,729 1,516,892 1,840,849 48,654
1 week ago 2017-02-14 82.6 1,096.75 2,143,225 1,520,081 1,840,849 48,729
1 month ago 2017-01-21 80.9 1,098.63 2,234,560 1,489,968 1,840,849 50,229
3 months ago 2016-11-21 83.6 1,100.08 2,307,036 1,538,834 1,840,849 51,396
6 months ago 2016-08-21 77.8 1,095.01 2,061,461 1,431,480 1,840,849 47,355
1 year ago 2016-02-21 67.1 1,092.28 1,938,041 1,235,428 1,840,849 45,228
*

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 2017-02-21 09:45 1,096.63 1,117.0 -20.4 below flood pool
1 hour prior 2017-02-21 08:45 1,096.63 1,117.0 -20.4 below flood pool
2 hours prior 2017-02-21 07:45 1,096.64 1,117.0 -20.4 below flood pool
6 hours prior 2017-02-21 03:45 1,096.64 1,117.0 -20.4 below flood pool
12 hours prior 2017-02-20 21:45 - n.a. - - n.a. - - n.a. - into flood pool
24 hours prior 2017-02-20 09:45 1,096.64 1,117.0 -20.4 below flood pool
48 hours prior 2017-02-19 09:45 1,096.65 1,117.0 -20.3 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 930.0 ft above NGVD29
Service spillway crest elevation 1086.4 ft above NGVD29
Conservation pool elevation 1117.0 ft above NGVD29
Volume under conservation pool elevation 3275532 ac-ft
Top of flood gate elevation 1140.4 ft above NGVD29
Emergency spillway crest elevation 1140.4 ft above NGVD29
Flood pool elevation 1140.4 ft above NGVD29
Maximum design elevation 1145.12 ft above NGVD29
Top of dam elevation 1152.3 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Lake Location