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Floodplain information prepared for this report is presented on this topographic md,,~IIl~, "nd cOl/il<s of tll"S~ floudplain r"dIlS dr~ ~vdildble fr'om the City of Fort Collins. The flood naps printed in this report are reduced toa scale of 1":200' foredsypresentation. Horsetooth Reservoir to the Cache la PoudreRiver, a distanceofdp proximately eight (8) miles (FiQure 2). The dra inage dt one time ,,~tf'nof'd flJrther Vlestward into the present Horsetooth Reservoir. ConstructionofthereserVOirinlgSl severed this part of the basin and has reduced the flood potentia 1 in Fort Collins. Field :iJrveys of O'O,S sections ,Iere cor"pleted by Gingery Associdte" In,-- anJ were supplemented with sections from the topographic mapping a srequired. Over fifty cross sections were tdken throughout the study reach at loca Cionswhich were critical to the hydraulic computations, and in areas wnere recent develop- ment altered the topography. In general, field information was consistent with the topographic mapping, unless noted otherwise. OrainageArea: BasinOrainage: Table 1 Orainaqe Ba,in Chardcteristics Nine (9) squaremi1es. West to East at one percent (1%) slope. Mean Basin Elevation: 5,050 ft. ~lSL. RECOtmA1SSANCE Most of the Spring Creek basin has soils typical of the Nunn-Fort Collins assoc- i a t i on or the Flu va q\Jen ts+ Fl u vents as soc i a t i Oil . ~luoll- Fort Co 11 i os so i1 s are yen- €rallylocatedintheNorthernandWesternportionsoftltebdsinandha.enodcrate in fil tra tion rates. The Fl ~vacuents-fl uvents soil s are locdted pri"'olrj ly d long the drdinageway dnd have mod€rate to lQW infiltrcltioll rates. Field Investigation A site reconnaissance of the Spring Creek Drainage Basin was conducted to g~in f~,d 1 i~rity wi til the study area. Durillg this invest igat ion, photogr~phs were ta ken along the ~tlJdy redch to a id the En~i neer in determi ning the Manll ings' "n" rou<.jM('SS caetficient for both the channel and overbank ,}rNS. These pf,atogrJphs are CQnta 1 n('(l w, th, n a separate "~:dnn' ngs' "n" Va I ue Repol.t" whlch is on f 1 Ie", t th" City of Fort Col'i'I~, dt Uw ColorddO Wdler C(}nserv~ti(l!l BOdrd, ~nd is in- cluded in the Spring Creek Technic~l Addendum. Ilydraulic data :;.ud as the iden- tification of cr'os~ iny st"uctures and the lIIe~sul'elllent of bridge Jnd culvert dirrensions were al~o gathered H tllat time. fWdl floodplJin and floadwJy bound- Land develo,lment ill the baSin is procef'ding rapidly. UrbanizdtiQn is allllost co~- p 1 e t e f ro I'~ LeMay A v e n u e ups t r (' a m tot h e C 0 lor ado to South ern R a i1 ra ad. L d n d lJ S e isprimarilyresi<lential with commercial de'lelopmentlinillgSo uthCollegeAv('nue. ariesalong'..;ithpreliminarj"desigr.a1terr.ati...e'S'..;erefie:dcheeked far accuracy ~ownstreJm of LeMay I,venue, the basin i~ largely de~elop~'d Oil th~ North side Of 5~1l"i ng Creek, but ollly part ia 11 y dev~ 1 op~d on th~ South s idt' _ Land use is aga i n rrsidentia 1 '~ith 1 i9ht industria 1 in the vicinity of Tiolbe,'l ine ROdd ~nd Prosuect <;tr~et. Develo~l'e~t i, planned in t~e nedr fub~'" at t.he property irl1r,ediately SO~ch of prospect Stret't downstrealn of Tic,berl ine Road_ a"dconsistency. Study 1,!-N_D_~5criptl9Jl Thp Spr'ir,n Creek Dr6;,lag(' nasin h locilti'd in ttl" neart of the City of Fort Co 11i n~. Tne bas in d ra i ns in an Ea 5ter I y d~ red i on frorr; Spri ng Canyon Calli at - 7 - "