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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2)

The annual average salinities of the waters of the Colorado River a) upstream of Morelos
Dam, b) arriving at Imperial Dam, and the resulting salinity differential were as follows:

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Waters

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U S Count
Wmn1

Mexican Count.
U2JmU

a)
b)

Upstream of Morelos Dam
Arriving at Imperial Dam
Salinity Differential

875
797
78

950
862
88

The annual average salinities resulting from operations under Minute No. 242, since it became
effective on June 24, 1974, are tabulated as follows:

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ANNUAL AVERAGE SALINITY (U.S. COUNT) AS TOTAL DISSOLVED SOLIDS
(PPM) DIFFERENTIAL
YEAR AT IMPERIAL DAM UPSTREAM OF MORELOS DAM (PPM)
1974 (Jun 25 - Dee 31) 832 972 140
1975 829 964 135
1976 823 955 132
1977 820 943 123
1978 812 928 116
1979 809 739 -70
1980 755 740 -15
1981 806 924 118
1982 825 933 108
1983 733 742 9
1984 670 676 6
1985 607 639 32
1986 579 600 21
1987 610 656 46
1988 655 733 78
1989 682 800 118
1990 721 846 125
1991 751 858 107
1992 781 898 117
1993 767 613 -154
1994 797 875 78

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'" The difference in the U.S. and Mexican counts is a result of different methods of analysis and of computing the total
dissolved solids used by laboratories in each country.

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