WSP12525

• File Number: 8282.400
• Description: Colorado River Operations and Accounting - Deliveries to Mexico
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 6/1/2002
• Author: Seven Basin States
• Title: Summary of Water Resources in Northern Mexico - Seven Basin States Ad Hoc Committee - 06-01-02
• Water Supply Pro - Doc Type: Report/Study

008483
Summary of Water Resources in Northern Mexico .

Sources of Colorado River Water Crossine International Boundary into Mexico
. U.S. Deliveries at Northern International Boundary (NIB).

· U.S. Deliveries in the Limitrophe Division from II-mile and 21-mile wasteways.

. U.S. Deliveries at the Southern International Boundary (SIB).

· Underflow of groundwater crossing the Limitrophe Division from application of water within
the boundaries of the Yuma County Water Users Association and West Cocopah Indian
Reservation.

· Underflow of groundwater crossing at the SIB from the application of water on the Yuma Mesa
in Arizona.

· Underflow of groundwater to Mexico from seepage from the All-American Canal (AAC).

· Irrigation drainage water from the Wellton-Mohawk Irrigation and Drainage District (WMIDD)
bypass drain to the Cienega de Santa Clara.

Table 1. Colorado River Water Crossing the International Boundary from the U.S. into Mexico (AF)

U.S.
Year Delivery
at NIBI1

Total U.S.
Deliveries in
Satisfaction
of Treaty

Total of All U.S.
Deliveries, GW
Underflow, and
Bypass Water

NR - Not Reported
/1 Data from IBWC (http://www.ibwc.state.gov/wad/colorado_river.htm)
/2 Data for limitrophe and SIB from USBR LCRAS reports
/3 Years 1990 - 1994 estimated as average of years 1995 - 2000
/4 Estimated as 90% of total seepage from AAC between Pilot Knob and Drop 3 (90% of 84,500 aflyr; FEISIFEIR, All-American Canal
Lining Project, March 1994, pp. 111-3 - 11I-8)
/5 USSR Decree Accounting Records

Page 3 of 10

Seven Basin States June 1,2002