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<br />Oct"ber 1981 <br /> <br />PURPOSE <br /> <br />SPECIAL' STUDY <br />CACHE LA POUDRE RIVER BASIN <br />LARIMER-WELD COUNTIES <br />COLORADO <br /> <br />The purpose of thisstOJdywastoa<laly.eflood-relatedprobleros <br />snd pro~fde information that will enable local govern~nts to make <br />dedaions that wll1 minimize or reduce flood hazarda ill the future. <br /> <br />SCOPE OF THE SPECIAL STUDY <br /> <br />VOLUME III <br />FLOOD PLAIN ANALYSIS <br />SHEEP DRAW <br /> <br />The courae of the study waS pri~rl1y determined through coordina- <br />tlon with the O~ha D1atrlct, CO!llrado Water Conservation Board <br />. <br />Larlmer County, ~eld County, the city of Fort Colllns, the city of <br />Gre~ley, and the Lar1mer-~eld Reglona.t Councll of Governments. <br />Numerous other agenc1es snd pr1vate interests were also contacted. <br />durlng the study. <br /> <br />Introdu ction <br /> <br />1970 and 1980. <br /> <br />The b.u!n "on~"ln8 " ""'::I1>"r .,f <br /> <br />A"thestudyprogressed, tssks..ere <ielet..d or added Inconsulta- <br />tlonwith localintereats to reapondto "hsnges In. Identifi..d needs or <br />pl'lor1t1ea. Since some "ork Items "ere 1ndppendent of other study <br />tasks, the "tudyresuUs8re presented.in.f\>ursep..ratevolu,""s. Vol- <br />u.... I consIders basin flood h.....rd... damaafety., 8nd'flood"u'ning. <br />Volu~e II pre~ent~ the detailed hydrologic analya1s for the baain. <br />Vol~s III llnd IV pt~..ent flood pl~ln.8tudie9 tor S~eep Draw and <br />Fossil Creek, reapectively, which are two tributariea of the Cache la <br />Poudre River lying In th" path of current urbaniUt1on. All' geographic <br />locations ref"rred to ar" in the State of Colorado unless other..i.." <br />Indicated. <br /> <br />BACKGROUND <br /> <br />gro.~lng ..r..". <br />about(,Operc"ntbet",een <br /> <br />The ~opl.ll"ti<'" of Lari....r <br /> <br />I.. Poudre lliver :,,,$1n i.u Colorado Is In" rapidly <br />and Weld Countles Increased by <br /> <br />The Cache <br /> <br />flood hazard "r<,a~, froOl narr".. canyon flood plain.. 1n the llIountainous <br />weat to wide valley floodplains In the east. Locslinterests are <br />concl.'roed about the changing nature of the flood hazards in the basin <br />as a consequence of urban growth, panieuhrly doce the catastrophlc <br />,. f"" '.0 .....er of 197(,. Dlscusslons regarding <br />Blg Thompson ~.ver ~oo " ,,~ ~ <br />a ..Ide rangtng "tudy of the baain were in1tiated between the Omahs <br />D1strict, Corps of Engineers ..nd local planners snd elected offlelals <br />1n 1977 and a plan of study ..as agreed upon. <br /> <br />PURPOSE AND SCOPE OF VOLUME III <br /> <br />AUTHORITY <br /> <br />One purpose nf the Cache I.. Poudre RIver Bss1n Special Study is to <br />present dats on <,xtsting nnd future flood potential for atreams subject <br />to the <'ff"cta of Incr<<aslng llrb<tn\%atl<ln. Two strea"", In the CaChe la <br /> <br />Thia study "as "",de under c""th\Uing authority in Se~tlon 206 "I <br />the 1960 Flood Control Act. as a~ended. <br /> <br />, <br />