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<br />SOURCES OF OATA ANO RECORDS <br /> <br />InformatIon about past <br />precipitation records, from <br />research of newspaper fIles <br />of other Federal agencIes. <br /> <br />U.S. Geolog!cal Survey <br />shown !n Table 2. <br /> <br />FLOOOSITUATlOr-l <br /> <br />this st<'ltlon were not used since peak flows result from clear weetner <br />snowmelt and are largely Independent of precIpitation at any given time. <br /> <br />The maps prepared lor this rApnrt wArA based on topographic maps <br />furnished ey tne city of Aspen or obtalned from prIvate SOurces. Tne <br />orlgin<ll mapsweremadetoascaleofl1nchequalsl00feetwltn <br />2-foot contour Interval and 1 Inch equals 200 feet wIth a 5-foot <br />interval. Structural data for bridges were obtaIned during field investi- <br />gatIons made during the course of the study or from the Colorado State <br />Department of Highways. <br /> <br />floods was developed from streamflow and <br />Interviews with local residents, from <br />and historical documents, and from reports <br />Basic hydrologic data were derived from <br /> <br />records of streamflow at tne gagIng statIons <br /> <br />FLOOD SEASON AND FLOOD CHARACTERISTICS <br /> <br />Hunter Creek above Mid- <br />way Creek near Aspen 1964-Present <br />Castle Creek near <br />~spen <br /> <br />Station <br />Number <br /> <br />Station <br />,,~ <br /> <br />2 <br /> <br />Roarin9 Fork River <br />below Aspen <br />Roaring Fork RIver <br />at Aspen <br />RoarIng Fork River <br />near Asp"n <br />Hunter Creek near <br />Aspen <br /> <br />, <br /> <br />4 <br /> <br />5 <br /> <br />6 <br /> <br />7 <br /> <br />Castle Creek abOve <br />Aspen <br /> <br />TABLE 2 <br /> <br />~TREAH GAGING STATIONS <br /> <br />Perlodot <br />Record <br /> <br />1913-1918 <br />1910-1921; <br />1931-1964 <br /> <br />1964_Present <br />1911_1913; <br />1950_1956; <br />1969-Present <br /> <br />1911_1920 <br /> <br />1969_Present <br /> <br />Maximum Recorded <br />Peak Flow <br />C.f.5. date <br /> <br />Floodflows on the Roaring Fork RIver and Castla and Hunter Creeks <br />result from rapId meltIng of the mountaIn snowpack during the period <br />from late May to early July. Snowmelt rnay occastonally be augmented by <br />rain. Snowmelt runoff Is characterized by su~talned perIods of high <br />f tows and marked dIurnal fluctuation. ExamInatIon of ~llmatotoglcal <br />and ~treamflow records shows that summer cloudbursts arc not a flood <br />threat on these streams. <br /> <br />Notav",llable <br /> <br />FACTORS AFFECTING FLOODING AND ITS IMPACT <br /> <br />3,170 Junel8,1917 <br /> <br />Obstruct10nsto FloOdflows. <br /> <br />1,310 July 1,1965 <br /> <br />Seven bridges over the Roaring Fork River, one over Castle Creek, <br />and two over Hunter Creek are obstructive to floodflows In the study <br />area. One bridge over the RoarIng Fork River and one over Kunter Creek <br />will be overtopped ~y floodwater, and all existing bridges cause a s19- <br />nlflcantrlselnthewatersurtaceupstream. Brush,timber,andotner <br />debris washed out durlng floods may collect On these bridges, thus <br />creating a d"mmln<:j effect and overbank flow, In some Instances, debrIs <br />may collect to the poInt ",here structural c<'Ipablllty 15 exceeded and <br />the bridge Is destroyed, or It may raise water levels to the extent <br />t~at abutments are eroded and t~e approach and overlying roadbed are <br />damaged. The SalvatIon Canal DIversion Oam also causes a rise In t~e <br /> <br />1,010 JuneU, 1953 <br /> <br />492 <br /> <br />July 6,1970 <br /> <br />1,090 <br /> <br />June 15 1918 <br /> <br />m <br /> <br />June23,1970 <br /> <br />There Is one precipitation station in tne area ImmedIately adJa- <br />cent to the study raachol the Roaring Fork RIver. However,datafrom <br /> <br />5 <br /> <br />6 <br />