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Show The commercial experiments ( 56 66 ) ( on an ) these rivers have , been few . ( There Tliere ) were none prior to statehood , ( ew- ew ) cept the ( Major 111aJor ) Powell . ( Brief , p . 30 . ) The Undine was launched in 1901 . ( M . R . 60,117 : ( Exceptions Dixceptions ) 13 , 49 . ) It made only two trips and was wrecked upon the riffles above Moab . With a draft of only 12 or 14 inches it was unable to avoid sand bars . When operating during high water the pilot was unable to hold the boat in the channel . A more detailed statement , R . Vol . 24 , p . 4210 . The City of ( Moab J11'oab J11oab ) ( ( M TM ) . R . 62 , 117 , Exception 49 ) made its appearance in 1905 for tourist purposes , , backed by adequate capital . The experiment was preceded by a survey of the river for commercial ( pos- pos ) sibilities . The boat drew between 12 and 24 inches . Its experience with the sand bars , current , etc . , was similar to the Undine . It took five days to make the trip from Greenriver to the mouth of the Green , 120 miles . ( R . Vol . 4 , pp . 737-740 . ) ( Changes Cbanaes ) were made in the City of Moab , and it was renamed the Cliff Dweller . With a draft of * only 20 inches , it had trouble with groundings on sand bars and ( riffles riffies ) . It made only one trip and on the return was tied at ( Halvorson's Halvorsons ) ranch ( be- be ) cause it could not ascend the riffles above the ( mouth inoutla ) of the San Rafael . After this trip the Cliff Dweller was dismantled . These were the major commercial attempts on the Green . Failure , due to river conditions , is evidence against navigability . Increasing the power of the boats would not have made the boats ( sue- sue suc- suc ) A |