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<br /> <br />GREEN RIVER <br /> <br />ATARACT I <br />CANYON <br /> <br />WESTWATER <br />CA N YO N <br />+ <br /> <br />/ <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />4900 <br /> <br />.:.;..... <br /> <br />LAKE:'.: <br />POWELL :0 <br />. . <br />. . <br />REACH 1 REACH 2 <br /> <br /> <br />.:::0::::::" <br /> <br />..'..... . <br />.. <br />. <br />~ :BLACK <br />DOLORES :ROCKS <br />RIVER : <br />. <br />. <br />. <br />. <br />. <br /> <br />REAC H 3 <br /> <br />- <br />- <br />- <br />- <br /> <br />z 4500 <br />o <br />- <br />to- <br /><( <br />> <br />W <br />..I <br />W <br /> <br />WESTWATER <br />CANYON <br />" <br /> <br />410 <br /> <br /> <br />....cCATARACT <br />CAN YO N <br /> <br />DEPTH t1~ <br />1ft I <br />20 <br /> <br />o <br /> <br />50 100 <br />RIVER MILE <br /> <br />150 <br /> <br />Figure 1. Map of the Colorado River study area (upper). The stippled areas <br />are canyons that separate the lo~er (reach 1), middle (reaches 2 <br />and 3), and upper (reach 4) study reaches. Numbers are river-mile <br />distances upstream from the confluence of the Colorado and Green <br />rivers. Arro~s indicate direction of river flo~. Belo~ is a <br />diagramatic representation of the river profile showing gradient <br />and mean depth. <br /> <br />7 <br />