Compacts, Decrees, and Treaties Affecting CO's Water

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with Iiexico concerning the waters of the Colorado River. In recognition of article III(c) of the Colorado River Compact relating to a future potential agreement with M;exico, Congress further sug- gested that Arizona and Califorr.ia should mutually zgree to supply the Lower Basin°s half oi any deficiency f-rom the main §tream of the Colorado River. Arizona adamantly refused to enter into the cospact suggested by Congress, a situation which continues to exist. However, this issue was at least partially laid to rest by the Supreme Court decision in the case of Arizona vs. California, and by certain prov3.sions of the Colora? ver Basin Project Act of 1968. A further provision of the Boulder Canyon Project Act gave congressional approval for the Upper Basin states to negotiate a compact among themselves dividing among the respective states the 7.5 maf apportioned to the Upper Basin by the Colorado River Compact. This the Upper Basin states did by the Upper Colorado River Basin Compact of 1948. 3. Tqexican Treaty and Protocol of 1944 On February 3, 1944, at Washington, D. C., a treaty was executed between the United States and Mexico relating to the Colo- rado Ri.ver and the Rio Grande. This treaty was subsequently rati- fied by the United States Senate on April 18, 1945. The most significant provision of that treaty relating to the Colorado River is as foll.ows : Article 10 Of the waters of the Colorado River, _from any and a11 sources, there are allotted to NIexico: (a) A guaranteed annual quantity of 1,500,000 acre-feet (1,850,234,000 cubic meters) to be delivered in accordance with the provisions of Article 15 of this Treaty. (b) Any other quantities arriving at the Mexican points of diversion, with the understanding that in any year in which, as determined by the United States Section, there exists a surplus of waters of the Colorado River in excess of the amount necessary to supply uses in the United States and the guaranteed quantity of 1,500,000 acre-feet (1,850,234,000 cubic meters) annually to Nexico, tihe United SCates undertakes to deliver to Mexico, in the manner set out in Article 15 of this Treaty, additional waters of the Colorado River system to provide a total quantity not to exceed 1,700,000 acre-feet (2,096,931,000 cubic meters) a year. I-lexico shall acquire no right beyond that provided by this subparagraph by the use of the waters of the Colorado River system, for any purpose whatsoever, in excess of 1,500,000 acre-fPp* (1.850,234,000 cubic meters) annually. - 7-