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<br />5 <br /> <br />6 <br /> <br />~ulated Flood Studies <br />The U~ I ted Slates Arcoy Corps of Engineer, (USACE), Sacramento Offi ce, <br />rrepared ~ Flood Pia in Informat Ion Report, dated Jun" 1973. for the RoarIng <br />F(>ck River. Cust Ie Creek, and Hunter C,,,,,k neilr A~p"n. Colorado (Refe rcnce <br />5). The lower I ,,,,it of the US.\CE Hudy w~. tnc Red Butte ROil~ Bridge, "hi<:h <br />is tne wpp"r 1 1m; t of thi s $t~dy. The Red Butte ~oa<l ~ridg" i, npproxim"t'" y <br />two mil ~" b~ I "w the Mil T St reet 8r i dg" wh i ch i ~ near the cente r of Aspen. <br />The flood flow est im~tes developed in th i s report for tile upper end <br />of rhi, 'tudy ~tches the flood flow e,timate, developed for the lower end <br />of the abovementioned study. <br /> <br />M~pS ~~d Surveys <br />The topog''''phic mappi ~g for thi s .tudy "a, provided by the State of <br />Colorado DepJrt'""~t of Highways. The mapp i~g was actually prep~red by Ai r <br />Photo Survey, of Grand Jun~t ion. Co lorado. Thi s muppi,,~ was ava i lac Ie at <br />scales of 1" .. 200' and I" - 1,00'. The ~"nt"ur interval of tM mapping was <br /> <br />5 feet (Reference I). <br /> <br />wright-McLay~hl i~ Engincers syrveyed 53 cross-sect ions in areas of <br />special interest (e.g. ',Ii de valley b<>ttoC150rwherc floodplain development <br />had occurred). In Jddltion, bridgc",e<l5Uremcnts"-'ere verified and spnt <br />ele~ation. taken at critic~1 points (Reference 13l. <br />,.onerall y, fie Id surveys a~recd we 11 wi th topogra~l,i e "'doping ex""pt <br />in Jre~s of heavy bru~h where the topographic contour, appeared to be high <br />Tn ~erta;n IO~dt ion,. <br />Vert i cal control points for the ~ro.s se~t ;UflS were three-quarter <br />inch rebar pins '",hich were used as aer i ~ I cont rol for the "'apping. The~.. <br />~"i~ts ~re shown o~ the mapping and are design~ted by letters and numbers <br />s imi I~c to CA-35. <br />