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lnt~oduct Ion Past flood damaqes along Toll Gate Creek 1'1 the study ~each hav~ not been groat because prlo~ to the I ate 1960's deve lopment 1 n tho basI n consisted of only a few scattered farm houses. several road c~osslngs, and a ~allroad crosslnC/. T~ flood plaln of Tall Gate C~ook from the mouH to Si~th Avenue waS def I nod In FlOOd PI aln Informat Ion Repo~t, Met~opolltan Region, Volume II, Sand, Toll Gate, and Lower Cherry Creeks, Ap~ll 1964. The Special FlOOd I-1azll~d Report to reviSe Volume II was pUbliShed In July 1971 and this ~epo~t e~tended the flOOd plain study up to tho confluence of East and 'II<lst Toll Gate C~eeks. Rapid e~pansion of tM city of Aurora, ColoradO lnto the basin area In recent yoa~s has prompted Aurora off lela I 5 to ~eQuest that the Corps 0/ Engineers p~epare a special flOOd hazard report on furthe~ rMches of Tolt Gate Creek. In addition, the city has embarked on a program of requiring channelizatIon of e",rtaln st~eam roaches as a condition tor flOOd plain development. This repo~t p~esents basln and stream characteristics, a qeneral discussIon of cIty pJans for channel Imp~ovements, flood hi story, and the probable hazard of major flooding under e~lstlng and Improved condltlons of To I I Gate Crcc~. as proposed by tho c! ty of Aurora. Two potent I a I floods, the Intermediate Raglonal and Standard Project Floods, are analyzed to dotor1'l\lne f lOad haz3rd~. The two floods are def 1 'led 1'1 the G lossery. Flooded a~ea maps ar~ p~esented to show the e~tent of flooding. Water surfllce proflles show tM probable depths of floods relative to the channel bed. Several cross sect lens are s~wn to IndicntA thA d"pth~ of potent!al floods across the vill lay. The data presented In tha ~apoM ~epre5ents a reasonable description of the flOOd hazards on Toll Gate Creek at Aurora. This report docs not Imply any Federal lnte.....st or authority to zon" or ~egulate use of the flood plnlns. Regulation of t~o flood plain Is a local responsib;llty. Community planne~5 can usa this ~eport to assure proper development In the flood plaIn areas of Toll GateCreok and to help reduce fllture flood d"",ages <It Aurora. Flood p~oofln'1. I I I , , I , I I I I I I I l,,<,ing or building ~eg~lations ",," iJ.. u~ed d~ "I h,n,,,t Iv"," to, or d~ a supplement to structural flood control methods. The Omaha District will provida, upon raquest, t..chnical asslstancetoFodaral,Stateandlocal agencies to Interprat and usa this report. Tno Omaha District can also supply pamphlets on flood plain management to interested agencies or persons such as "'Ju Idell nes fo~ Reducing Flood Dnmagas" and" Introduct Ion to Flood Proofing". Basin and Stream Characteristics Tol I Gate Creek f lows northweste~ly to ente~ SMd Creek at Aurora, Colo~ado. Located prlmar! Iy In Arapahoe County, tho lower reaches of the bastn extend Into Adams County. Planned expansion of the corporate limits of Aurora will Include a major portion of the basin. AbOlltO.5mlleupstream from SI~th Avenue is the confluence of East and West Toll Gate Creeks; th..se two streams plus an unnamed trlbutary of Wost Toll Gate Creek a~e the hree principal drainage courses 1'1 tho basin. The downstream end of the CherryCroekLakaemergencysplllwayleadstoasrnal1 West Toll Gate Creek tributary referred to as the Cherry C~eek Spl Ilway Draln in this rGPo~t. Tho Intermediate Regional flood originating on the t~ibut8ry ls shown, ~ut tho Qmorgoncy flows from Cherry C~eek Lake belng considerably ~re rare than the lntermediate Regional flood are not shown. Table I prescnts drainage a~9as at seve~al points in the Toll Gate Creak b1lsin. A ~p of the basin is shown On the Inside front cOVer of this repo<t. Tdbl,,1 DRAINAGEAHEAS Stream Tall Gate Creek Toll Gate Creek Toll Gate Creek West Tall Gato Creek East Toll Gate Creek Iln""""..t! r~....k C.'e~ry Creek Spillway D~aln Locarion ~outh, at Sand C~eek Sixth Avenue Confluence of Eest & 'lI€!stToIIGateCreeks Mouth DralnageArea Sq.Ml. 40.8 34.7 ~uth 34.3 23.5 10.8 ^" M,,<,th Mouth ,,' 2