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<br />.~,.M~225. <br /> <br />AVAILABILITY OF COLORADO RIVER WATER <br />FOR SUPPLYING PRESENT AND PLANNED <br />DEVELOPMENT IN NEW MEXICO <br /> <br />Under the heading "New Mexico Present and Planned Use of <br /> <br />Water", previously presented in this report, reference is made to let- <br />ters of June 10, 1958, and December 23, 1957, from New Mexico State <br />Engineer, S. E. Reynolds. <br />Wi th further reference to these attachments, Mr.. Reynolds <br />states in his letter of June 10, 1958, "For planning purposes both <br />New Mexico and the Bureau of Reclamation assume that the Colorado <br /> <br />River Compacts and the available water supply will permit ultimate <br />depletions at the sites of use in New Mexico amounting to 838,000 acre <br />feet per year". This assumption is obviously based on taking 11.251. <br />of the full 1922 Compact allocation to the Upper Basin States of' <br />seven and cme-half million acre feet per annum less the 1948 Upper <br />Basin Compact allocation of a fixed 50,000 acre feet annually of the <br />Upper Basin's share in the river to the State of Arizona. This as- <br />sumption requires that the average annual virgin run-off at Lee Ferry <br />is and will continue to be at least fifteen million acre feet and <br /> <br />that there be sufficient surplus in the increments to the flow of the <br />river between Lee Ferry and the International Boundary with the Repub- <br />lic of Mexico to fulfill the Treaty obligations of the United States <br />to the Republic of Mexico with respect to Colorado River water. <br />Estimates made by the Bureau of Reclamation indicate that <br />the average annual virgin runoff of the Colorado River at Lee Ferry, <br />for the 48 year period 1909-1956, was 15.2 million acre feet. For <br />the 29 year study period used in this report, 1928-1956, these estimates <br /> <br />-20- <br /> <br />._ ,.<2. ,'''; _.. <br /> <br />," ':,'~ <br />