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<br />BACKGROUND INFORMATION <br /> <br />UnnamedGulchdr-alns.15squar-emlles. <br />bank tributary of Falls Gulch. 8.aslnelevlltlons <br />between 6,850 feet m.s.!. and 5,77010.5.1. <br /> <br />It ISllrlght <br />genorallyrange <br /> <br />PRINCIPAL FLOOD SOURCES <br />The Cache la Paudre River begins In the Rocky Mountains <br />at the Continental Divide In north centrlll Colorado. The river <br />tlows In a general easterly dIrection through Poudre Park to Its <br />confluence with the South Platte River- east of Greeley, Colorado. <br />The river drains about 415 squer-o miles upstream from Paudre Park. <br />Elevations In the basIn upstreem from Paudre Park rllnge from 13,500 <br />feet above mean sea level (m.s.I.J'to5.650feetm.s.l.atPoudre <br />Park. <br /> <br />SOURCES OF DATA AND RECORDS <br />Information on past floods was obtained from Corps of <br />Engineer flood records, U.S. Geological Survey stream gaging <br />records, residents of Paudre Par-k, the Stete of Color-ado, end <br />Lar-lmer County. Cross section date end topographic mapping having <br />a contour I nterVi5 I of 2 teet and a scale of I Inch equals 200 teet <br />were established by photogrlllTrlIetrlcmethods fr04'\'leerlal photogrephs <br />teken on 5 May 1977. These data were furniShed by Larimer County <br />In cooperation with the Colorado Water Conservation Board. U.S. <br />GeologIcal Survey 7.5 minute quadrangle maps with 40-toot contour <br />intervals at a scale ot I Inch equals 2,000 teet were also used <br />In the study. Bridge and roadway survey datll were furniShed by <br />Larimer County. <br /> <br />Howlett Gulch, a left blink tributary of tho Cache la <br />PoudreRlvor, drains an area of 23 square mIles 10c/ltednorthand <br />west trom Poudre Park. EI",vations In the basln r-ango from about <br />7,700 teet 10.5.1. to about 5,670 feet m.s.l. <br /> <br />Hili Gulch isa right bank trlbutllryof theCacoo la <br />PoudreRlver. Itdralns5.6squllr-emllesandhasbaslnelevatlons <br />r/lng1n9 from 7,700 teet m.s.l. to 5,654 foet 10.5.1. The Hili Gulch <br />basin Is located south and Wllst from Poudre P/lrk. <br /> <br />STREAM GAGING RECORDS <br />Stream gaging data used In the studywerecollec-ted by <br />the U.S. Geological Survey on -the Cache la Poudre River /It loc/l- <br />tlons about 10 miles upstream and about 9 miles downstream from <br />Poudre Park. Tables 1-3 provide data pertinent to these stream <br />gaging stations. <br /> <br />Falls GulCh drllins/ln area of 1.3squaremllesloc/lted <br />south~stfromPoudrePllrk. Baslnelevatlonsrllngefr04'\'l7,560 <br />feetm.s.l. to5,1575feetm.s.J. FllllsGiJlchlsarlghtbank <br />trlbutllryoftooc"chelaPaudreRlver. <br /> <br />Watha Gulch, /I rIght ~nk tributary of Hili Gulch <br />drains an area of I.l squllre mIres southeast from Poudre Park. <br />Basin elevations range approxirnlltely between 7,500 teet m.s.l. and <br />5,735feotm.s.l. <br /> <br />2 <br />