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Show Oallvillo is ( located loctited ) ( about aboA ) 22 65 ( miles iniles ) below the lower ( ciicl Ollcj ) of the ( Grand Orand ) Canyon , Prom ( Oallville Callville ) the river ( continues ontinues ) ( generally genertilly ) ( southward soutliward ) 333 miles to ( Yuma Yuina ) , flowing through a wide desert valley . ( U . S . Geological Survey River Survey ( maps iiiaps ) . ) Green River . ( -O-reen Oreen ) River ( and aiid ) its tributaries drain an area ( comprising coniprising ) a large part of western Wyoming , ( northwestern northivesterii ) Colorado , and eastern Utah , bounded ( on oil ) the north and ( east cast ) by the Wind River ( Mountains 1ountains ) and the range forming the ( Con- Con ) tinental Divide , ( on oil ) the south and east by White River Plateau and the Book Cliffs ; and on the north and west by the Gros Ventre and Wyoming ( Mountains 1ountains ) and the Great Wasatch Range . The . area is roughly ( triangular tTiangular ) in shape ; its greatest length north and south is 370 miles and its greatest width 240 miles . ( Hie The ) total area is approximately 45,000 square miles . ( Page 3 , Exhibit 85 . ) The river heads on the western slope of the Wind River Mountains and flows generally ( southward southwart ) across western Wyoming . ( Page 3 , Exhibit 85 . ) At Green River , Wyo . , its ( mean inean ) flow is 2,040 ( second- second ) feet , its minimum about 220 ( second-feet secondfeet ) , and its maximum 21,800 ( second-feet secondfeet ) . ( Prom From ) September to February the ( average aveTage ) mean monthly flow varies from 401 to 973 ( second-feet secondfeet ) and from March to August varies from 1,110 to 7,680 ( second-feet secondfeet ) . ( Pages 61-69 , Exhibit 88 . ) |