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Show This poiiitis ( where whara ) the Green 70 River flows through the UffitahAloulitains . ( R . 340 . ) In his ( comparison coinparison ) he took the Columbia River at an elevation of ( 145 1.45 ) feet above sea level , and in his estimation boats operate up to the Columbia as ( far Thr ) as the mouth of the Snake , ( and aud ) on up ( the tho ) Snake River , and ( he lie ) wanted to select a point on the ( Columbia Oolumbia ) River ( where whore ) there would be no question of it being navigable . ( R . 341 . ) He made a study of all the rivers as outlined on the map that covers the Green , Colorado , and San Juan Rivers , above Lees Ferry , on the San Juan to Chinle Creek , the Colorado to Grand ( Junction Jiniction ) , and the ( Green G-reen Green ) River to Green River , Wyoming , and the reason his figures stop at Green River , Wyoming , was because that was the end of the river survey . The map he refers to is called Shaded Relief Map of the Colorado and Green Rivers , with Profiles . ( R . ( 341A-342 341A342 341-A-342 341A342 ) . ) This map could have been made ( half half- half ) as big , or larger , if he had wanted it . He took the ( Colorado ColoTado ) River from Grand Junction at about an elevation of 4,558 feet . That is also the end of the river survey . ( R . 342-343 . ) He does not believe the Geological Survey has any surveys on the lower Columbia River or the Snake River , as the Geological Survey does not work , in general , on navigable streams . He ( knows licnows ) that one fork of the Snake River rises in ( Yellow Yellow- Yellow ) stone ( Park Pttrlc ) , and the other west of Yellowstone Park . ( R . 343 . ) |