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<br />Q, <br /> <br />.... <br />o <br />,:;:. <br />0) <br /> <br />DESCRIPTION OF BASIN (continued) <br /> <br />and the San Juan are the other principal tributaries of the Colorado River <br />in the Upper Basin. <br /> <br />The flows of the San Juan River are now controlled by the Navajo Dam, <br />the Green River by Fontenelle and Flaming Gorge Dams, and the Gunnison <br />River by the Wayne N. Aspinall Unit Dams. Glen Canyon Dam is the only <br />major dam on the main stem of the Colorado above Lee Ferry, but it will <br />permit control of almost all flows leaving the Upper Basin. <br /> <br />The natural drainage area of the Colorado River below Lee Ferry and <br />above Imperial Dam is about 75,10u square miles (195 OOu km2). This <br />section or the river is now largely controlled by a series ot storage and <br />diversion dams starting with Hoover Dag and ending at Imperial DaQ. <br /> <br />At the present time there is no significant storag,e or. the main river <br />or on the tributaries between Glen Canyon Dam and. Lake Mead. The inter- <br />vening tributary inflow is erratic but amounts to almost enough to offset <br />the evaporation from Lake i1ead. <br /> <br />Lake Mead provides most of the storage and regulation in the LOkler <br />Colorado River Basin with the water being stored for irri6ation, municipal <br />and industrial uses, generation of electrical power, flood control, and <br />other beneficial uses. <br /> <br />.1 <br /> <br />Lake Mohave, the reservoir <br />stages about 67 miles (108 km) <br />plant. Storage in Lake Hohave <br />from Hoover Dam, for meet ing <br />developing power head for the <br />Powerplant. <br /> <br />formed by Davis Dam, backs water at high <br />upstream to the tailrace of Hoover Power- <br />is used for some reregulation of releases <br />treaty requir~ments wit:1 i-lexic.o, and for <br />production of electrical energy at Davis <br /> <br />The river flows through a natural channel for about 10 miles (16 km) <br />below Davis Dam at which point the river enters the uroad ~'iohave Valley 33 <br />miles (53 km) above the upper end of Lake rtavasu. <br /> <br />Lake Havasu bacKs up behind Parker Dam for about 45 miles (72 km) and <br />covers auout 25,000 acres (10 100 halo Lske Havasu serves as a forebay <br />from which the Hetropolitan Water District of Southern California pumps <br />water into the Colorado River Aqueduc t. Havasu Lake wi 11 also serve as <br />forebay for the Central Arizona Project pumping plants and aqueciucts. Lake <br />Havasu and Alamo Dam and Reservoir are used to control floods originating <br />below Davis Dam and above Parker DaM. <br /> <br />./', <br />, . <br />; <br /> <br />Headgate Rock lJam, Palo Verde Diversion Dam, and Imperial Dam all <br />serve as diversion structures with practically no storage. Imperial DaP.l, <br />located some 150 miles (240 km) dOlffistream frOl'l Parker Dam, is the major <br />diversion structure to irrigation projects in the Imperial Valley and YUllIa <br />areas. It diverts water on the right bank to the All-American Canal which <br />delivers water to the Yuna Project in Arizona and California and Imperial <br />and Coachella Valleys in California. It diverts on the left bank to the <br />Gila Gravity Main Canal. <br /> <br />10 <br />