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Show 532 above the dam . It would have submerged Bluff completely , and , as he recalls , it would back the water up some twenty or ( twenty-five twentyfive ) miles above Bluff . ( R . 1839 . ) He knows of no streams above the dam site , up as far as Farmington , New Mexico , that run all the year around , except possibly the Mancos River . At the ( time tin-le tinle ) he saw the Mancos River it was maybe flowing twenty or thirty ( second-feet secondfeet ) . The ( Mancos Alancos ) enters the San Juan River about twenty or thirty miles below Farmington , New Mexico . ( R . 1840 . ) In figuring a dam at this point he took into ( con- con ) sideration the effect of the sand and silt . He had no silt samples taken and had no figures on it , but took it into consideration in submitting his report . He ( didn't didnt ) make a reconnaissance of the possible irrigable lands above the dam site , as the purpose of the reservoir on the San Juan was not for ( irri- irri ) gation of any area of the San Juan . The idea was for upstream storage of the Colorado River for flood control . ( R . 1841 . ) On the lower river they have an annual ( sum- sum ) nier flood , ( melting nielting ) snows ; in the upper reaches of the Colorado River the investigation work was started in this year 1914 with the idea in view , , , of surveying reservoir sites and dam . sites that would store this excess water , or the summer ( run- run ) off from the melting snow 7 to control these floods . . This Bluff dain site on the San Juan was for the partial purpose of controlling that degree of the |