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<br />FLOOD HI STOF<Y <br /> <br />The most frequent cause of flooding along the study reaches <br />is rapidly melting heavy snowpack during May, and June. <br />Rainfal I on melting snow may hasten the melting process and <br />increase floodflows. <br /> <br />Summer thunderstorms are also a contributor to flooding, <br />especially on Grove Creek. It is pr-obable that the most <br />extreme flood would be caused by general rain over the <br />entire basin of Plateau, Grove, and Buzzard Creeks. <br /> <br />The Town of Collbran has no available records of flooding. <br />According to information obtained from a stream gage on <br />Plateau Creek, located approximately E) miles east of <br />Co I I bran, a flood on PI ai;eau Cre,.k in 1922 had an est imated <br />discharge of 3,080 cubic feet per second (cfs). Based on the <br />hydrologic analyses presented in the 1981 Flood Insurance <br />Study, that flood had a frequency in excess of 100 years. <br /> <br />Floods during the period of 1982-84 changed the channel <br />a I i gnment and geometry at some I ocat ions a long F'I ateau <br />Creek. This was one of the factors that initiated this <br />study. <br /> <br />7 <br />