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<br />I <br />I <br />I <br />1 <br />1 <br /> <br />r" <br /> <br />f <br /> <br /> <br />r <br /> <br />I <br />Ii " <br /> <br />The US Army Corps of Engineers, Sacramento District, prepared a <br />Hydrology Report on the Colorado River on the Colorado River from <br />Glenwood Springs to DeBeque Canyon in 1985 (8). The downstream <br />limit of the Corps I report is approximately 8 river miles <br />upstream of the, Town of Palisade. This report analyzed post- <br />reservoir conditions on the Colorado River, resulting in new <br />flood estimates. The results listed in the Hydrology Report are <br />summarized below. <br /> <br />Colorado R. below Plateau Cr. <br /> <br />10-vr <br />32,900 <br /> <br />50-vr <br />44,400 <br /> <br />100-yr <br />49,300 <br /> <br />500-yr <br />61,000 <br /> <br />B. Tributaries in Project Area <br /> <br />The Flood Hazard Information Report for Fruita, prepared by the <br />Corps in 1976 (3), includes hydrologic investigations of Big Salt <br />Wash and Little Salt Wash. <br /> <br />r <br /> <br />II <br /> <br />The hydrology for Horizon Drive Channel was studied initially by <br />the Corps in 1976 (2). In May of 1988, the City of Grand <br />Junction conducted a new study to reflect added detention in the <br />basin (9). This study resulted in lower estimated flood peaks. <br /> <br />Ii <br />Ii <br />I <br />{ <br />1 <br />I' <br />I, <br />I <br />I <br />I - <br /> <br />III. General Hydrologic Information <br /> <br />The snowmelt floods of 1957, 1962, 1983, and 1984 were four of <br />the highest experienced in the past 50 years. In 1983 and 1984 <br />floods caused considerable damage in the City of Grand Junction <br />where emergency dikes were constructed to protect homes and, <br />businesses when the Colorado River overflowed its banks. The <br />flood of 1984 resulted in a major Presidential Disaster <br />Declaration. <br /> <br />The flood that occurred in June-July 1884 is consid~red the most <br />severe on the Colorado River. It was caused by heavy rains on a <br />deep snowpack resulting in rapid melting (3). <br /> <br />Highest peak flows recorded on the Colorado River have been as a <br />result of spring snowmelt, sometimes accompanied by rain showers. <br />Summer thunderstorms sometimes occur over tributary basins <br />resulting in high runoff, but these storms are usually isolated <br />and do not occur over the entire upper Colorado River watershed. <br /> <br />-3- <br />