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great canyon, and the lower region below the great canyon (in- cluding the temitory drained by the Gila, Little Colorado, and other lower tributaries), Lee Ferry is situated at the head of the canyon, in the State of Arizona, a few miles southerly from the intersection of the Colorado River \vith the boundary common to the States of Arizona and Utah, and is the natural point of dcmarcation between the upper region and the lower region, All waters of the entire river system within the upper region (including those returning to the river from irrigated. lands) unite to form a single stream at ,"ee Ferry, where the flow may be measured and recorded, The compact conforms to this natural division, The upper region, plus all' lands outside the drainage area which may be beneficially served by waters diverted from the dver, is desig- nated as the "Upper Basin," The lower region is designated as the "Lower Basin." The seven States are grouped into two political divisions, Colorado, New Mexico, Utah, and Wyoming, constitute the "States of the Upper Division," '1'he States of Arizona, California and Nevada constitute the ."Lower Division." 7,500,000 acre-feet exclusive annnal beneficial consumptive use is set apartand apportioned in perpetuity to the Upper Basin and a like amount to the Lower Basin, Any waters necessary to supply lands in the Republic of Mex- ico (hereafter to be determined by international treaty) shall be supplied' from the surplus flow of the river, If the surplus is not sufficient, any deficiency shall be borne equally by the Upper Basin and the Lower Basin, By reason. of development upon the Gila Hiver and the prob- able rapid futUre development incident. to the nec"ssary construc- tion of flood works on the low"r river, the Lower Basin is per- mitted to increase its dev"lopment to the extent of an addi- tional one million acre-f"et annual benefici'll consumptive use before beiug mjthorized to call for a further apportionment of any surplus wa1;"rs of the river, No further apportionment of surplus waters of the river shall occur within the next forty years, At any time aftel' forty years, if the development in the Upper Basin has reached 7,500,000 acre- feet annual beneficial consumptive use 01' that of the Lower Basin has reached 8,500,000 acre-feet, any two States may call for a further apportionment of any surplus waters of the river, but such supplemental apportionment shall not aft'ect the perpetual apportionment of 7,500,000 acre-feet made to cach basin by this compact. ' The States of the Upper Division shall not cause th" flow of the river at ,"ee Ferry to be depleted b"low an aggregate of 75,- 4 [ 4 ]