WSP06672

• File Number: 8271.300
• Description: Colorado River Basin Salinity Control Program - General Information and Publications-Reports
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 3/13/1985
• Title: A Report on Operations for the Solution of the International Problem of the Salinity of the Colorado River Under Minute No. 242 for the Period January 1 1984 - December 31 1984
• Water Supply Pro - Doc Type: Report/Study

2

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2) The average salinities of the waters of the Colorado River a) upstream of
Morelos DaD\ and b) arrivi.ng at Imperial Dam and c) the resulting salinity
differential were as follows:

,.j:>. Waters
0 a)
00 Colorado River upstream of
W Morelos Dam
b) Arriving at Imperial Dam
c) Salinity Differential

Total Dissolved Solids in ppm!L
1984
U.S. Count ---- Mexican Count

676
670
6

758
736

22

The Commission agreed by exchange of letters that the records show that the
differential during calendar year 1984 was in accord with above cited Point
1 of Minute No. 242.

The results of operations under Minute No. 242 since it became effective on
June 24, 1974, are tabulated as follows:

Salinity in ppm (U.S. Count)
Year Imperial Dam Above Morelos Dam Differential
. 1974 (June 25 to December 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

The results of operations under Minute No. 242 are shown graphically on Exhibit
2, which also shows the salinity of the waters arriving at Imperial Dam and
of the waters made available to Mexico at the Northerly International Boundary
since 1951, the first full year of deliveries to Mexico under the Water Treaty
of 1944.

_!/ The difference in U.S. count and Mexican count are due to use of different
methods of analyses and of computing the total dissolved solids, by each
country I s laboratory.

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