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. IntroductIon This SpecIal flood Hazard Information Report for the South Platte River in Morgan County and WaShington County, Colorado was prepared by the Omaha DIstrict, Corps of Engineers, under continu- Ing authority provided by SectIon 206 of the 1960 Flood Control Act (Public law 86-645), as amended. The report was requested by the Colorado Water Conservation Board. The purpose of tl'lls report is to present Information describing the South Platte RIver and its flood plain In Morgan County and In Washington County relative to past flooding as well as to potential future flooding_ This report basically shows the relationship of tile 1973 flood on the South Platte River In Morgon County end Washington County to tile IOO-year flood. Information on the 10-, 50-, and SOO-year floods Is also presented. The Information provided varies from stage- dischargo relatIonshIps at each cross section In the rural areas to water surface profIles In the urban areas. Thr~ghout the study reach, flOOd widths have been IndIcated at each cross section loca- tion. . The Information in this report Is Intended for use primarily by planners concerned with the area. This report does not Imply any Federal IntereST or aUThoriTY to zone or regulate The use of tho South Platte River flood plain In Morgan County or In WashingTon CounTy; this Is a local responsibility. The report provides a suitable basis for the adoption of land uso con~rols to guide flOOd plain development with consIderaTion for environmental attrIbutes . thereby preventing IntensifIcation of loss problems. Since It Identifies flood problems, the reporT wilt stimulate Tho develop- ment of other flood damage reduction techniques such as flood oontrol, re~val of oh~trucTlonS and flood proofIng, whIch mIght be used In an overall Flood PlaIn Management (fPMl program. Olstrlbutlon of the report to officials, agencies, and Indi- viduals concerned with planning In the area covored Is made by Morgan County and by Washington County. The Corps of Engineers will provide Interpretation and technical assistance, If requested, In applicatloo of the report data, Other guidelines available from the Corps of EoglOOArs are a pamt>hlet. "Guidelines tor Reduc- Ing flood Oamages", and a booklet, "Introduction to flood Proofing", Basin and Stream CharacterIstics The South PlatTe River In Morgan County flows In a general easterly direction from the Wold-Morgan County line to about fort Morgao, Colorado where it gradually turns and flows In a north- easterly directIon Into Washington County To tho WashIngton-Logan County lIne. Throughout this reach the South Platte River flows lnarelativolywelldefinedchannet, This channel Is typically braIded and Is situated In a bnoad shallow vel ley ranging In width from about 1,500 feet to about 21,000 leet and Is flanked by roll- log plaios. The streambed slope ot the South Platte River in Morgan and Washington COunties ;s relatively uniform generally rangIng between 9 feet per m;le dnd 5 feet per mile and averaging 6.5 feet per mile. Thedraln<lgeareaoftheSouthPlatteRlvor In Morgan and ~ashlngton Counties varies consldorably from the Wold-Morgan County line to the Washington-logan County llno due mainly to tho number of relatively large tributaries draining pri- marily tho plains region located to the south of Morg<ln and Washington Counties, Table I gives drainage areas of the South Platte River at stream qaqe locations within Morgan and Washington COunties. . , 2 ! . . ,- - --