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Show stages , except at high water 185 . ( R . 2363-2365 . ) ( Dur- Dur ) ing seven ( years' years ) observation ( he lie ) was not able to follow or locate deep places in the river , had to hunt for channel ( R . 2367 ) ; every change in the river volume means a rearrangement of the channel and sand bars ; any change makes it a different river . ( En- En ) countered sand bars below San Juan ( R . 2370 ) . In 1911 on a trip from Hite to Lees Ferry with Bert Seaboldt , ran on to rocks in Trachyte Rapids , and below Shock Rapids . Found a gravel reef ( R . 2371 ) ; between North Wash and Red Canyon on trip in 1929 , with a ( 16-foot 16foot ) boat , touched bottom with oars in lots of places . Trachyte Rapids is bad water ; ( couldn't couldnt ) use motors ; there is a gravel reef there that runs across the river ( R . 2401 ) ; with twelve to fourteen thousand ( second-feet secondfeet ) of water , touched rocks in Smith Fork Rapids . Dragged motor along on gravel above Lake Canyon ( R . 4202 ) ; at Shock Rapids took the same channel he had taken before , but it proved to be the wrong one ; severe rapids with four big rocks ; zigzagged through there by inches ( R . 3404 ) . 1915 , Wimmer . - ( M . R . 135 . Abs . R . , Vol . 2 , pp . 1200-1203 : ) In the fall of 1921 operated boat at Halls Crossing ; was a rowboat with Evinrude motor and went about 30 miles from Halls Crossing , in connection with the Chenoweth expedition . In going over Bull Frog rapid , would have to use oars to get over them . This was the last of August or the First of September . ( R . 4756-4757 . ) In the Fall of 1929 , he met the |