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extraordinary drought or serious accident) and up to 1.7 maf per year in years of <br />surplus on the Colorado River. <br />• Upper Colorado River Compact (1948) <br />In 1948, the Upper Basin states entered into a compact which apportioned <br />among themselves the waters of the Colorado River available to the Upper Basin by <br />the 1922 Colorado River Compact. The 1948 Compact apportioned to Arizona <br />50,000 acre -feet per year while the other Upper Basin states received a percentage of <br />the remaining apportionment as follows: <br />Colorado ...... ............................... 51.75% <br />Utah........: ............................... 23.00% <br />Wyoming ...... ............................... 14.0()% <br />New Mexico .... ............................... 11.25% <br />Under this formula, if 7.5 MAF were available to the Upper Basin annually, <br />Colorado's apportionment would provide for the consumptive use of 3,855,375 acre - <br />feet of water annually. <br />The 1948 Compact also provides that consumptive uses under the 1922 La <br />Plata River Compact shall be charged to the apportionments made to the states under <br />Article III of the 1948 Upper Colorado River Compact. It also apportions water <br />between Colorado and Wyoming on the Little Snake River in a manner that gives <br />preference to pre- Compact water rights. Further, it requires that Colorado will not <br />cause the flow of the Yampa River at the Maybell gaging station to be depleted below <br />an aggregate of 5 million acre -feet for any period of ten consecutive years reckoned <br />in a continuing progressive series beginning in 1949, and provides that any of the <br />Upper Basin states may exceed the basic apportionment provided that it does not <br />deprive another state of its apportionment. <br />• Colorado River Storage Project Act (1956) <br />After the ratification of the Upper Colorado River Compact, Congress was <br />receptive to approving this Act which authorized the construction of Glen Canyon, <br />Flaming Gorge, the Aspinall Units (Curecanti), and Navajo dams. This Act also . <br />established the Upper Colorado River Basin Fund to which operating revenues would <br />be credited and used to help pay for the projects. The Act further authorized the <br />investigation and development of several "participating projects" specifically aimed at <br />helping the Upper Basin States develop their compact apportioned waters. <br />• Arizona v. California 373 U.S. 546 (1963) <br />Arizona brought suit under the original jurisdiction of the U.S. Supreme Court <br />3 <br />