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~... 000391 However, the interstate situation was such that the upstream development could not proceed until the water use problems among the three interested states were composed. The development of water supplies in the remainder of the West also was or ogres sing at a rapid rate. One of the principal rivers in that region, the Colo- rado River, was almost untouched except for the Gila river development in Arizona, "nd the developments which served the Imperial Valley and the Mexicali area in California and Mexico, respectively, and some small upstream areas in other states. A great Dotential existAn in ~nnne~~inn with the G01~r~d0 Rive;. F~; sc~e ti~e orivate power concerns had been interested in constructing dams on the Colorado Rive, '~o generate hydroelectric energy, Southern California being the principal market for such energy. The lower Colorado River basin states, particularly the State cf Calif- ornia, became interested in power development; the United States became interested; ~nd, finally, after a series of investigations, the site of Hoover Dam was chosen for ~he initial major development on the river. Because of the experience of New Mexico and Colorado with respect to the Elephant Butte development, some farsighted persons, among whom the most impor- tant was the Honorable Delph E. Carpenter, an outstanding water attorney of Colorado, conceived the idea of a compaot to apportion the waters of the Colorado River in order that the upper basin would have a \"later supply reserved for future development. It appeared certain that lower basin df!velopment would proceed faster than that in ~~e upper basin ang~ cin the absence of' reserving such a water supply, the upper basin ~ight be without water for its inevitable and desirable future development. Finally the Colorado River Compact was negotiated and signed in 1922. This was precedent to the authorization of the construction of Hoover Dam. The authorizing act for Hoover Dam, which included also the authorization of Imperial Dam and the All-/~erican Ganal, also gave the consent of the Congress to the Colorado River Compact. Exhibit No.2 is an outline map of the western portion of the United States, upon which has been indicated all water projects which have been constructed, or authorized for construction, Or are beinG proposed for river basin development as the result of the terms of international treaties or interstate compacts. Reference is first made to the lower Colorado River basin and the ~rojects which have been constructed and are being proposed, which "robably could not ~ave been constructed or proposed except for the Colorado River Compact. Hoover Dam and Lake Meade which it creates have been in successful operation since 1935. Parker Dam which creates Lake Havasau, which is essentially the diversion ',orks for the Los Angeles Aqueduct, has been in operation since 1938. Hydroelectric energy is also generated at that dam. Davis Dam, which creates Bullshead reservoir, has just gone into operation. Energy will be generated at that dam, and it ultimately vlill be used essentially as afterbay stora;:e to reconcile the use of water from Lake !.Ieade for the generation of hydroelectric enerGY ,lith the subsequent use of that water downstream for consumptive use purposes. One of the stated purposes also for Davis Dam and Bullshead reservoir in its authorization act is to "meter out water to Mexico." The line of the Los Angeles Aqueduct which transports Colorado River water to Southern California is shovill upon the map. This aqueduct could not be operated on a firm basis without the regulation supplied by Hoover Dam and Lake L~ade. Imperial Dam, the All-American Canal, and the Gila Canal are also in- dicated on the map. The All-American Canal supplies 'later to the Imperial Valley and for that purpose replaced the old Alamo Canal which, because of topography extended -4-