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. . . R Report of the Regional Director f' f" P"" r~ .:Iv':"> PLAN OF lEVELOPMENT 39. The Initial Development is keyed to transmountain diversion of water from the Colorado River drainage eastward to the Upper Arkansas River Valley. The diverted water and reregulated native Eastern Slope water would provide for sup- plemental irrigation, furnish supplemental and new supplies of municipal water, and enable the generation of hydroelec- tric power. Other multiple-purpose aspects of the project include flood and sediment control, stream pollution abate- ment, fish and wildlife conservation, and enhancement of recreational opportunities. All estimates, specifications, and description of features are necessarily preliminary and subject to some modification and refinement when detailed datil be co IlES a vai la He . \ 40. As a result of the diversion of water from the Colorado River Basin, this potential Initial Development is consistent with the purposes of the Colorado River Storage Project. The extent of its relationship to the Upper Colo- rado River Basin development and to the Upper Arkansas River Basin development can be more firmly established as those developments proceed. In its plan for the Colorado River Storage Project the Bureau of Reclamation contemplates at least SL~ major regulatory reBervoirs in the Upper Colorado River Basin. The need for the storage Project stems from the compaets pertaininG to Co!orado River waters. The Colorado River Compact apportions the use of 7.5 million acre-feet of water annually to the Upper Colorado River Basin. It also provides that the states of the upper di- vision (Colorado, New Mexico, Utah, and Wyoming) will not cause the flow of the river at Lee Ferry, Arizona, to be depleted below an aggregate of 75 million acre-feet for any period of 10 consecutive years. This compact was signed November 24" 1922, and made effective pursuant to the t.erms of the Boulder CAnyon Act. The Upper Colorado River Compact in turn apportions the use of Colorado River water to the four states And Arizona, and provides for the sharing of joint water obligations of the four states. The Upper Colo- rado River Compact was signed October 11, 1948, subsequent!y ratified by the upper basin states and approved by the Con- gress. Full consummation of the apportioned uses of Colo- rado River water in the upper basin states, consistent with the rights and obligations of the compacts and the Mexican Treaty of 1945, would require construction of major regula- tory reservoirs in the upper basin. 13 ~ ~,