The International Boundary & Water Commission, United States Section
Updated Rio Grande National Ownership of Waters
Stored At The International Amistad and Falcon Dams
Determination of ownership in the reservoirs is made weekly for the accounting period ending on each Saturday at midnight. Field data collections, exchange of data between the U.S and Mexico, and computation of national ownerships are usually completed by Thursday afternoon or Friday morning of the following week. Data are PRELIMINARY and subject to REVISION.
Estimated ownership @ 2400 hours on 11/27/2021
36.8% of U.S. Total Conservation Capacity
11.4% of Mex. Total Conservation Capacity
Amistad Dam
Water Surface Elevation Feet Meters
Top of Normal Conservation 1,117.00 340.462
  @11/27/2021 1,069.62 326.020
Conservation Storages
Country Million
Cubic Meters
Thousand
Acre-Feet
United States 2,271 1,841
Mexico 1,770 1,435
Total Conservation* 4,040 3,276
*Values may not sum due to round-off error
Ownership and Releases @ 2400 hours on 11/27/2021
Country Million
Cubic Meters
Thousand
Acre-Feet
Requested
Releases
CMS
Requested
Releases
CFS
United States 1,128 914 20.0 706.0
Mexico 255 207 3.00 106.0
Total Storage 1,383 1,121 23.0 812.0
% of US Capacity @ Normal Cons. 49.7%
Inflows, Releases, and Losses for week of 11/21-11/27
U.S. Inflows (cms) 19.2 Total Inflows 25.3
U.S. Releases (cms) 21.5 Total Releases 24.9
U.S. Losses (cms) 4.92 Total Losses 6.03
Falcon Dam
Water Surface Elevation feet meters
Top of Normal Conservation 301.20 91.805
  @11/27/2021 258.86 78.900
Conservation Storages Normal Conservation
Country Million
Cubic Meters
Thousand
Acre-Feet
United States 1,913 1,551
Mexico 1,352 1,096
Total Conservation* 3,265 2,647
*Values may not sum due to round-off error
Ownership and Releases @ 2400 hours on 11/27/2021
Country Million
Cubic Meters
Thousand
Acre-Feet
Requested
Releases
CMS
Requested
Releases
CFS
United States 413 335 5.00 177.0
Mexico 102 83 12.3 435.0
Total Storage 515 418 17.3 612.0
*Values may not sum due to round-off error
% of US Capacity @ Normal Cons. 21.6%
Inflows, Releases, and Losses for week of 11/21-11/27
U.S. Inflows (cms) 23.4 Total Inflows 28.1
U.S. Releases (cms) 9.54 Total Releases 14.5
U.S. Losses (cms) 2.80 Total Losses 3.50
Note: All dam measurements based on elevation above mean sea level.
Conversion Table
Rio Grande Flow and Reservoir Storage Conditions (Updated daily Monday through Friday)
1996-Present Amistad-Falcon Ownership Trends
Other Graphics
For further information concerning the content of this page contact:
Mr. William D. Finn
Chief, Water Accounting Division
e-mail: william.finn@ibwc.gov
(915) 832-4789
Last Updated 12/02/2021