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Show ( When 'When When ) ( he lie ) made the statement 1398 in the letter , ( "The The ) rivers indicated are not navigable on a commercial basis , but under stress of necessity certain stretches may be negotiated with ( light-draft lightdraft hight-draft hightdraft ) boats of certain types , " he meant that under present conditions of the river , unimproved as it is , that ( he lie ) could not compete in carrying freight on the long haul between ( Green- Green ) ( river -river river ) and Moab with trucks or the Denver & Rio Grande Western Railroad , and neither could ( he lie ) carry passengers and compete with the railroad , trucks , and buses . He ( couldn't couldnt ) ( cany carry ) them at the same price . ( R . 5417 . ) He has seen many thousand tons of rock fall about ten or twelve miles below Greenriver , ( he lie ) believes in 1910 . He has seen rock fall just below the junction , and at the junction , and he has seen other rock fall but not in the river . There are only two occasions that he knows of rock falling in the river . The rock that fell ten or twelve miles below Greenriver was on the east side , when the face of the cliff broke off and fell down . It ( wasn't wasnt ) a slide . The other point was just below the junction , and he ( doesn't doesnt ) believe that fell in the river . ( R . 5418 . ) He has never attempted to navigate , Cataract Canyon , on a commercial or on any basis . He has been through Cataract Canyon on foot along the bank of the ( river'to riverto ) the mouth of the Dirty Devil . ( R . 5418-5419 . ) At times he had to climb out on the cliff and come in at another point . One place he recalls , ten miles below the first Cataract where he went out , and another place twenty miles below the |