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I I I I I I I I I I I I I I I I I I I and wheat beginning in 1959. The alfalfa acreage has been steadily increasing from 14,000 acres in 1959 to 36,000 in 1970 and 71, The yield dropped from 3~ tons per acre in 1960 to 2 3/4 tons in 1967 then skyrocketed to 5~ tons in 1968 and has remained steady. Wheat acreage rose fairly steady from 65,000 in 1959 to 128,000 in 1965, dropped for a year or two then climbed to 172,000 in 1970. Yield has steadily increased from 28 bushels per acre in 1959 to 53 bushels per acre in 1971. Apparently salty water and salted subsoil have not affected these crops. Major Works on the River Now for a quick look at Figure 10 which gives the flow of the Colorado River at three key stations: Lees Ferry, which is below Glen Canyon Dam, the discharge from Hoover Dam and across the Northern Boundary to Morelos Dam. You will note that water released from Glen Canyon Dam in 1962, the year that it was closed, was less than that which crossed the Northern Boundary; releases from Hoover were only sufficient to meet downstream requirements. Also note that releases from Hoover and the volume crossing the Northern Boundary are quite constant beginning with 1961. The quantities of water available to Mexico up through 1960 were not and are not available after that time. Figure 11 is Glen Canyon Dam in Arizona near the Utah border, Figure 12 is Senator Wash Dam which was put into operation in 1966 to help overcome the vagaries of regulating diversions at Imperial Dam, which. has no storage, and is three days' flow below the nearest storage at Parker Dam. (Sorry, no picture of Parker Dam). Senator Wash reservoir is in a side tributary ou the California side and is filled by pumping and emptied by gravity, - with appropriate generating facilities, This was the final step by the United States that made it possible to control quite closely the 1,500,000 acre feet going to Mexico. -6-