WSP02631

• File Number: 8278.400
• Description: Title I - Mexican Treaty and Minute 242
• Basin: Colorado Mainstem
• Date: 1/1/1994
• Author: IBWC
• Title: Minute 242 Annual Report
• Water Supply Pro - Doc Type: Annual Report

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A REPORT ON SALINITY OPERATIONS
ON THE COLORADO RIVER UNDER MINUTE NO. 242

January I - December 31, 1994

This report presents the results of operations from January 1 through December 31, 1994, under the
agreement with Mexico entitled, "Permanent and Definitive Solution to the International Problem of
the Salinity of the Colorado River", incorporated in Minute No. 242 dated August 30, 1973, of the
International Boundary and Water Commission, United States and Mexico. The operations began
on June 25, 1974, immediately following approval of the Enabling Legislation, Public Law 93-320.

This report is based upon records of flows and salinities determined jointly by the United States and
Mexican Sections of the International Boundary and Water Commission, the U.S. Bureau of
Reclamation and the U.S. Geological Survey. Locations and features referred to in this report are
shown on the map, Exhibit 1.

The records show that the operations by the United States resulted in compliance with the agreements
in Minute No. 242.

The Salinity Differential

Minute No. 242 provides in Point 1 that:

"The United States shall adopt measures to assure that. . . the approximately
1,360,000 acre-feet (1,677,545,000 cubic meters) delivered to Mexico
upstream of Morelos Dam, have an annual average salinity of no more than
115 p.p.m. ! 30 p.p.m. U.S. count (121 p.p.m.! 30 p.p.m. Mexican count)
over the annual average salinity of Colorado River waters which arrive at
Imperial Dam, . . ."

The records show that during 1994:

1) Scheduled deliveries of water of the Colorado River in the quantity of 1,850,234,000 cubic
meters (1,500,000 acre-feet) were made to Mexico in 1994 in accordance with Article 10 of
the 1944 Water Treaty consisting of 1,695,143,000 cubic meters (1,374,266 acre-feet) in the
river bed above Morelos Dam and 155,091,000 cubic meters (125,734 acre-feet) across the
land boundary near San Luis, Arizona and in the limitrophe section of the river below
Morelos Dam.

Other waters arriving at the Mexican points of diversion amounted to 30,856,000 cubic
meters (25,015 acre-feet), consisting mainly of regulatory waste.