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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- Tng authority provided by SectTon 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 tuture flooding. This report basically shows the relationship of the 1973 flood on the South Platte River in Morgen County and Washington County to the 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 tor use primarily by planners concerned with the area. This report does not imply any Federal Interest- or authorlt-y to zone or regulate t-htl uStl of tho South Platte Rivtlr flood plain In Morgan County or in Washingt-on Count-y; this Is a local responsibility. The report provides a sulhble basis for the adoption of land usa con~rols to guide flood plain dovelopment with consideration for environmental attrIbutes , thereby preventing Inton~!flcatlon of loss problems, Since It Idontlfles flood problems, the report wilt stimulate the dovelop- ment of other flood damcge reduction tcchniques such as flood control, re~val of oh~truct-Ions and flood proofing, WhIch might be used in an overall Flood Plain Management (fPMl program. Oistrlbutlon 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 applicatlollof the report data, Other guldelillos available from the COrps of Engllleers are a pamphlet, "Guidelines for Reduc- ing flood Oamages", and II booklet, "Introduction to flood Proofing", Baslll and Stream Characteristics The South Pllltt-e River In Morgan Count-y flows In a general easterly dlrectioll from the Wold-Morgan Coullty line to about fort Morgan, Colorado where it grlldually turns and tlows In a north- easterly direction Into Washington County To tho Washington-logan County line. Throughout- this reach the South Platte River flows In a relatively well defined channel, This channel Is typically braided and Is situated in a bnoad shallow valley ranging In width from about 1,500 feet to about 21,000 leet and Is flanked by roll- illg plaills. The streambed slope of the South Platt-e River in Morgan and Washington COunties is relatively uniform generally rangIng between 9 feet per mile dnd 5 feet per mile and averaging 6.5 feet per mile, ThedralnageareaoftheSout-hPlatteRlver In Morgan and Washington COunties varies considerably from the Weld-Morgan County line to the Washington-logan County line due mainly to the number of relatively large tributaries draining pri- marily the plains region iocated to the south of Morgan and Washington COunties, Tablo I glvos drainage areas of the South Platte River at stream qaqe locations within Morgan and Washington Counties. . , 2 ! . . ,- - --