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<br />Gaqinq <br /> <br />I <br />I <br />I <br />I <br />Station <br />I <br />, <br />I <br />, <br /> <br />Years of Record <br /> <br />Leach Creek <br />At Durham <br /> <br />1 <br /> <br />Lewis Wash I <br />Near Grand Junction <br /> <br />1 <br /> <br />Mack Wash <br />Near Mack <br /> <br />1 <br /> <br />Mesa Creek <br />Near Mesa <br /> <br />23 <br /> <br />Plateau Creek <br />At Upper statlion Near Collbran <br />Near Cameo I <br />N ear Co llbr an' <br /> <br />22 <br />39 <br />53 <br /> <br />Reed Wash <br />Near Loma <br /> <br />1 <br /> <br />Salt Creek <br />Near Mack <br /> <br />1 <br /> <br />West Divide Creek <br />Below willow Icreek, Near Raven <br />Near H.aven <br /> <br />13 <br />20 <br /> <br />.. <br /> <br />I <br />West Salt Cree~ <br />Near r-1ack <br /> <br />1 <br /> <br />3.2 HydraulicAnalyses <br /> <br />Analyses of the hydraulic characteristics of streams in the county <br />were carrted out to provide estimates of the elevations of floods of <br />selected :t;'ecurrence intervals along each stream studied in detail. <br /> <br />Flood ele~ations were determined through use of the U.S. Army Corps <br />of EngineJrs HEC-2 computer program (Reference ll). <br />I <br /> <br />Cross sections for backwater analyses were surveyed or otherwise <br />developed!for representative locations throughout the stream reaches <br />studied by detailed methods. Additional cross sections were made in <br />the vicinity of bridges to determine the backwater effect of these <br />structures. Cross sections for the Colorado River, Leach Creek, and <br />Horizon Dtive Channel were developed from topographic ma~s provided <br />, <br />by the U'9' Bureau of Reclamation at a scale of 1:2400, with a con- <br />tour interval of 2 feet (Reference 12). Cross sections for West <br />Creek wer~ obtained by field survey. Supplementary data were obtained <br />from fiel~ observations and from U.S. Geological Survey 7.S-minute <br />series topographic quadrangle sheets (Reference 13). <br /> <br />17 <br /> <br />__ ~ I <br /> <br />,- --,' <br />