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<br />OdOI>"T 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 this study ~as to analyze floOd-related proble~e <br />and pr"vlde InforOlatlon that "ill enable local govermD.ente to <nake <br />decisions thst ,,111 D.l1nlmhe or reduce flood hazard,. In the future. <br /> <br />SCOPE OF THE SPECIAL STUOY <br /> <br />VOLUME III <br />FLOOD PLAIN ANALYSIS <br />SHEEP DRAW <br /> <br />The course of the atudy "48 primarily deter$ined through coordi.na- <br />tion "lth the Omaha Di.trlct, Colorado Water Conservation ~oard <br />. <br />LarImer County, Weld County. the city of Fort CollIns, the city of <br />Greeley, snd the Latimer-Wold Reglondl Counetl of Governmen~a. <br />Numerous other agencles and private Intereats ~e also contacted <br />during the study. <br /> <br />Introdl1 ction <br /> <br />As the study progressed. tasks were deleted or added in coneu!ta- <br />tion "lth local intereats to respond to changes In tdentified needs or <br />priorities. SInce ao"'~ ..ork Item" "ere independent of other study <br />tasks, the study re"ulta are presented in four separate volu....". Vol- <br />".... I c008idero basio flood haJ<ard~. dam safety. and flood ""rning. <br />Volu~ II pr~senta the detailed hydrotoRic snalysis for the basin. <br />V~1~c3 III a"d IV present flooJ plain studl~. IUl Sh~~~ Ora" and <br />Fossil Creek, respectively, which are t"o tributaries of the Cache 1" <br />Poudre Rh'er lying io the path of current urb<loizatioo. ..,11 g<"ographtc <br />locations refetred to are 1n the ~tate of Colorado unleas otherwise <br />indicated. <br /> <br />BACKGROUNO <br /> <br />ThOi' Cache laPoudreRtver;,a..1n 10 Colorado 1s Ins rapidly <br />gro~lng arca. The population of Lari~r and Weld Counties increased by <br />about 60 percent between 1970"",,1'\130, Th.. ba"ln cont...lM" ",-,,,,b,,,, of <br />flood hazard areas, fro~ narrow canyon flood pla1ns in the m<luntainous <br />west to wide valley floodplains tntheeast. 1.ocal ioterestsare <br />concerned sbout the changing nature of the flood hazards In ~he basin <br />a8 a consequence of ur~o growth, particularly aince the catastrophic <br />Ug Thompson River flood 10 the sum"",r of 1976. Discussions rp_&arding <br />awidc ranging "tndyof thcbasiower.,inlti8tedhet"eentheOOl8ha <br />D1atrict, Corps of EnglnQers snd local planners and ele~ted officials <br />in 1~77 and a plan of stndy ~us agreed opon. <br /> <br />PURPOSE AND SCOP!: OF VOLUME !I! <br /> <br />AUTHORITY <br /> <br />One purpose of th",Cache la Poudre River lI"alnSpeclal Study 18 to <br />pr~sent data on existIng and future flood potentIal for stre"~" aubJect <br />to the effects of inrr.,aslng urbanization. T..o "trelt~" In the Cache la <br /> <br />Tbh sludy '''''" "",de Llnd,'r .:o"t1n"iog aucharily in Section 206 of <br />the 1~&0 Flood Control ~ct, itS ~~cndcd. <br /> <br />l <br />