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I I I I I I I I I I I I I I I I I I I Rights to the Colorado River water are divided arrong the lJI:per Basin States (Wycrning, Colorado, New Mexico, and utah), the Lower Basin States (Arizona, Nevada, and California) and Mexico. Each Basin has a right to benefical constlllpti"Ve use of 7.5 maf of water per year, and Mexico has a right to 1.5 maf per year. Since normal flows are insufficient to rreet all the cannitments when the states are using their total apportionrrents, the Federal Government (see Table 1, Public Law 90-537) has been given the responsibility to augrrent flows in the Colorado River to = an adequate delivery to Mexico. ~ Water quality is generally good near the headwater of the system but ..--... ~teriorate~as the water flows toward the Gulf of California. Basin States approach full use of their apportionrrent, expected to worsen. Without additional salinity control efforts, the salinity at Illperial Dam could reach as high as 970 parts per million (p/m) of total dissolved solids ('IDS) by the year 2010. However, salinity control rreasures are being :i1tq;>lemented which should maintain salinity at or below the standard of 879 p/m at IIrperial Dam. In the mid 1960' s, the quality of water being delivered to Mexico becarre so poor that Mexico filed a formal protest with the United States. As a result, Minute No. 242 (Minute) of the nm: was adopted. Based on the provisions of the Minute (see Table 1) and the asSUlTpt:ion that the water quality standard would be maintained at a max:ilTDJll\ of 879 p/m, the quality of water arriving at M)relos Dam would range frcrn 964 p/m to 1,024 p/m. P' TJ --, · , \ ' " , " ~,' " " ~ . g't ~~ 1. ~ ;::: r.: ~ :~~.~ :.:. \ ~<. y 3 ~ ~ ~ r~ :~ f" ::'d ........- ~'4.'-..1",,:.1 ;'l ~,~~; ~);..:.; ;"<". ~ .~~~ "~.~. '" . ~ ! !.~.~~ r~ '!: \/ ; E : J]' N