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Show 5 that is to say , between July 10 and October 1 , of the same year , 150,000,000 tons passed that gauging station in ( sus- sus ) pension . We respectfully submit that even Complainant must be in a somewhat uncertain state of mind with reference to the amount of silt and sediment carried in suspension in these rivers . We concede that they carry a considerable amount of solid matter in suspension , but fail to see wherein it has affected or now affects navigation except for its ( con- con ) tribution to bars in the streams which may impede the progress of one not familiar with their location . It is true that the vast territory in eastern and ( south south- south ) eastern Utah lying tributary to these rivers is sparsely settled and undeveloped and that hundreds of thousands of acres are as barren as was Salt Lake Valley when the Mormons arrived there in 1847 . It is one of ( America's Americas ) last frontiers . We believe that the evidence establishes that its potentialities in wealth and resources are very great , and ( if such considerations were at all material ) earnestly contend that these three rivers , which are obviously susceptible of being used as highways for ( com- com ) merce , should not be declared ( non-navigable nonnavigable ) because of the dire prophecy of counsel for Complainant as to what the future of that section may be in agriculture , stock raising , coal , metals , oil and other products . ( Notwithstanding twithstanding ) the undeveloped state of the country and its sparse population , each of these rivers has a history of navigation which conclusively demonstrates its ( naviga naviga- naviga ) ¬ bility . The navigable capacity of each of these streams is not ( "occasional" occasional ) or ( "exceptional" exceptional ) but is present during every season of the year , including the low water stage . In its brief , Complainant has referred to certain ( por- por ) tions of the testimony of certain witnesses who stressed difficulties incident to navigating the rivers . Without ( at- at ) tempting a digest of the entire testimony of the witnesses we will now invite attention to certain pertinent portions of the testimony of each witness who was examined as to the navigability of these streams . TESTIMONY AS TO NAVIGABILITY . Because of the similarity of the rivers and of the ( boat boat- boat ) ing experience of those who have navigated them , and because the experience of most of the witnesses was not ( con- con ) fined to one river or one section of a river and in giving their |