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Colorado River below Lee Ferry. The Upper Basin states are Colorado, New <br />Mexico, Utah, and Wyoming, with a small portion of Arizona tributary to the <br />Colorado River above Lee Ferry. <br />Article III of the Compact apportions the waters of the Colorado River to the <br />Upper and Lower Basins as follows: <br />1. - The Compact apportions the right to exclusive beneficial consumptive <br />use of 7.5 million acre -feet (maf) of water annually from the "Colorado <br />River System" in perpetuity to the Upper Basin and the Lower Basin. <br />2. The Compact allows an additional 1.0 maf per year of increased <br />beneficial consumptive use to the Lower Basin. <br />3. It provides water for Mexico pursuant to treaty. Water must first <br />come from any surplus over the waters allocated to the states in Article <br />M(a) and (b). If that surplus is insufficient, then the burden of that <br />deficiency shall be shared equally by the Upper and Lower Basins. <br />4. The Compact provides that the Upper Basin states will not cause the <br />flow of the river at Lee Ferry, Arizona to be depleted below an <br />aggregate of 75 maf for any period of ten consecutive years beginning <br />with the ratification of the Compact. <br />5. It provides that the Upper Basin states will not withhold water and the <br />states of the Lower Basin shall not require delivery of water which <br />cannot reasonably be applied to domestic and agricultural uses. <br />• Boulder Canyon Project Act (1928) <br />This Act authorized the construction of Hoover Dam and the All- American <br />Canal to the Imperial Valley in California. It also, in effect, apportioned the Lower <br />Basin states allocation under the Colorado River Compact giving California 4.4 maf, <br />Arizona 2.8 maf, and Nevada 0.3 maf. Arizona was also given exclusive beneficial <br />use of the Gila River outside of the mainstem allocation of 2.8 maf. In making these <br />allocations the Act provided protection against unlimited development in the lower <br />basin. The further provides some assurances that the Colorado River Compact will <br />not be nullified. <br />• Mexican Treaty (1944) <br />In 1944, the United States and Mexico signed a treaty concerning the waters of <br />certain international rivers, including the Colorado River. The treaty guaranteed a <br />scheduled annual delivery of 1.5 maf to Mexico (except in the event of an <br />2 <br />