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<br />UJ0223
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<br />-42-
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<br />MlSC3LLAN:>OUS ISri ':tiN DUM - FACTS
<br />COLORJ..OO RIVER
<br />
<br />The average annual i10w of the Colorado River at Yuma. Arizona, s
<br />16,000,000 acre-feet ranging from 8,000,000 acre-feet in low years to
<br />25,000,000 acre-fe~t in high years. It is evident that a large volume
<br />reservoir capacity is required for complete utilization when it is
<br />stated that floods of as great as 200,000 second-f.oet have occurred in
<br />the lower river.
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<br />The lower portion of the Colorado River basin is arid in charccter.
<br />and the water supply originates chiefly in the high mountains of Wyoming,
<br />ColoradO, Utah. and new ltlxi co; 92 per cent of the annual average flew
<br />at Yuma, Arizcna comes from the Green. Grand, 8.ljd San Juan Rivers,
<br />
<br />At the present time the total area irrig,ted from the Colorado
<br />River and its tributories approximates 2,000,000 acres, of which about
<br />100,000 acres lie in Old Mexico. The undeveloped irrigable area that
<br />is considered feasible of development according to present standards
<br />may spproximate 4.000.000 to 5,000,000 ocres, of which 700.000 aores
<br />lie in old Mexioo.
<br />
<br />To show the approximate extent. distribution, and re1.tion of the
<br />present irrigated and undeveloped irrigable arc.^.s of the Colorado River
<br />basin. the following table prepared by Mr, John T. Hhist1er. engineer
<br />of the United States Reclamation Service. is quoted (see Sighteenth
<br />Annual Rec 1emeti on Report, p. 399)s
<br />
<br />Distribution of Irrigation and lrrigable Areas,
<br />
<br />State
<br />
<br />Area Irrigated
<br />in 1916
<br />Aores
<br />393,000
<br />209.700
<br />452,200
<br />47,000
<br />356.225
<br />5,315
<br />365,040
<br />1,828,480
<br />75,000
<br />1,903,4BO
<br />ultimately irrigatedl- -
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<br />
<br />';yorning
<br />Utah
<br />Colorado
<br />New Me :cic 0
<br />Arizona
<br />Nevada
<br />California
<br />United states
<br />}Iexic 0
<br />Total
<br />Total area that may be
<br />Un! ted States
<br />llixico
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<br />Total ultimate area irrigable in Colorado
<br />River Basin
<br />
<br />Colorado River Basin,
<br />Jr.rdit1ona1 Area
<br />That May Be
<br />Irrigated
<br />Acres
<br />358,000
<br />3)6,300
<br />492,000
<br />71,000
<br />326,940
<br />11,260
<br />1,018,690
<br />2,614.190
<br />719,400
<br />3,333,590
<br />Acre s
<br />4,442 ,600
<br />794,400
<br />
<br />5,237,000
<br />
<br />1916
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