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<br /><::) <br />r- ) <br /> <br />narrO't-J" canyonso Major tribut~ries include Willo"T Creek.q Fraser River, <br /> <br />N <br />W '\:Jilliamst Fork River9 Troublesome Creek.l) and Blue Rive:i.">, at respective <br />00 <br />tv distances approximately 4, 89 24~ 32, and 41 river miles downstream from <br /> <br />Granby Damn Upon the waters of the Colorado and of eA.ch tributary stream <br /> <br />there are existing demands for local irrigation ~nd domestic use.. There <br /> <br />are also existing and proposed demands for transmount:dn diversions to <br /> <br />supply municipal, agricultur~l, and industria.! uses.. <br /> <br />11. Geology and Soils.. Hiddle Park is the southern portion of a <br /> <br />l~rger elliptical basin subdivided by the volcanic rocks of the Rabbit <br /> <br />Ears Range.. Before the last ice~age, this basin was filled with sedimentary <br /> <br />and volcanic rocks.. Alpine glaciation later formed limited and discontinuous <br /> <br />valley flats and terraces.. The present drainage system has cut deep valleys <br /> <br /> <br />in the volcanics and sediments of the basin floor...!! <br /> <br />""..'. <br /> <br />12. The flats along the Colorado River are covered by shallow, dark- <br /> <br />colored gravelly loams of alluvial origin, overlying water~soaked sands and <br /> <br />gravels 0 On the upper terraces, of which there are three distinct levels, <br /> <br />top soil is generally deeper and more suited to agriculture.. On these <br /> <br />upland benches, and also on the steep hillsides and ridges, grey~brown <br /> <br />podzolic soils hgve formed under a. vegetative cover domina.ted by lodgepole <br /> <br />pineo There are also large ~reas covered by soils consisting largely of <br /> <br />imperfectly weathered rock fragments with a cover dominated by sagebrush.. <br /> <br />These latter soils a.re grouped as lithosols.. <br /> <br />130 Underlying the topsoil are beds of varying thicknesses, composed <br /> <br />for the most part of glacia.l.$' sandy, grevelly, or rocky clays.. These. are <br /> <br />interbedded with occa.sional layers of gl~.cial silts silty loams, sands, or <br /> <br />gravels.. The whole structure is highly susceptible to erosion.. Any maj or <br /> <br />disturbance, as by overgrazing.\l careless logging.~ or construction activities, <br /> <br />usually results in accelerated erosion.\l bringing quanti ties of sediment into <br />=4- <br />