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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, .-Ihi<: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 />t.-lO 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 />oftheab<!vementioned 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 />s~ales of 1" .. 200' and I" - 1,00'. The ~"ntour interval of tM mapping was <br /> <br />5 feet (Reference I). <br /> <br />wright-McLau~hli~ Enginee~s su~v~y~d 53 cross-sections in areas of <br />spec i al i "terest (e. g. ',lide valley b<>ttoC15 o~ where floodplain development <br />had occur~ed). In Jdd I tion, bridge ",e<lsurernents ,",'ere ver i fied and SpClt <br />ele~ation. taken at c~i t i c~1 poi nB (Reference 13l. <br />(".onerall y, fie Id surveys a~reed we 11 wi th topogra~l,i C II1dpping "x""pt <br />in Jreas of heavy b~u~h where the topographic contour, appeared to be high <br />Tn ~ert..;n locdt ion" <br />Ve rt i ca I con t ro I po i nts fo~ th" ~ co.s sect i (if1S we re th ree-quar ter <br />i~ch rebar pin, '"hich were used as ae~ i ~ I cont rol for the "'apping. The~.. <br />~"ints ~re shown o~ the ,"app;n~ a~d are designated by letters and numbers <br />similactoCA-35, <br />