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1.3 Coordination In correspondence dated September 22, 1983, FEMA requested that the Technical Evaluation Contractor, Dames & Moore, prepare a Flood Insurance Study for the unincorporated areas of Yuma County based on data from the COE report (Reference 1). The final coordination meeting was held on July 31, 1984, and was attended by representatives of FEMA, the study contractor, and the county. No problems were raised at the meeting. 2.0 AREA STUDIED 2.1 Scope of Study This Flood Insurance Study covers the unincorporated areas of Yuma County, Colorado. The area of study is shown on the Vicinity Map (Figure 1). Flooding on the North Fork Republican River was studied by detailed methods from the eastern county boundary with Dundy County, Nebraska, to a point 42 miles upstream of that county boundary. The areas studied by detailed methods were selected based on the extent and validity of available hydrologic and hydraulic data. Chief Creek was studied by approximate methods, however, upstream of Road FF the flood plain is less than 200 feet wide, and is there- fore not shown. Areas not included in this study are the Towns of Eckley and Yuma and the City of Wray. 2.2 Community Description Yuma County is located approximately 135 miles east of Denver in northeastern Colorado. The county is bounded by Chase and Dundy Counties, Nebraska, and Cheyenne County, Kansas, to the east, Kit Carson County to the south, Washington County to the west, and Logan and Phillips Counties to the north. The population of the unincorporated areas of Yuma County was 1,641 in 1980, a decrease of 60 percent from the 1970 population of 4,139 (Reference 2). The headwaters of the North Fork Republican River basin originate within Yuma County approximately 15 miles southwest of Wray. The river then flows in an easterly direction eventually draining into the Arikaree River, approximately 25 miles downstream of Wray. 2