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FLOOD INSURANCE STUDY 1.0 INTRODUCTION 1.1 Purpose of Study This Flood Insurance Study has been prepared to revise and update a previous Flood Insurance Study for the unincorporated areas of Garfield County, Colorado. This information will be used by Garfield County to update existing flood plain regulations as part of the regular program of flood insurance by the Federal Emergency Management Agency (FEMA). The information will also be used by local and regional planners to further promote sound land use and flood plain development. In some states or communities, flood plain management criteria or regulations may exist that are more restrictive or comprehensive than the minimum Federal requirements. In such cases, the more restrictive criteria take precedence and the State (or other juris- dictional agency) will be able to explain them. 1.2 Authority and Acknowledgments The sources of authority for this Flood Insurance Study are the National Flood Insurance Act of 1968 and the Flood Disaster Protec- tion Act of 1973. The hydrologic and hydraulic analyses for this study were performed by the U.S. Army Corps of Engineers (COE) , Sacramento District, for the Federal Insurance Administration, under Inter-Agency Agreement Nos. IAA-H-16-75 and IAA-H-7-76, Project Order Nos. 20 and 1, respectively. Revised hydrologic and hydraulic analyses for the Roaring Fork River, Cattle, Rifle, and Government Creeks and Hubbard Gulch along with new hydrologic and hydraulic analyses for the Crystal River, Fourmile, Threemile, and Mitchell Creeks and Helmer and Ramsey Gulches were performed by Simons, Li & Associates, Inc., for FEMA, under Contract No. EMW-C-0942. This study was completed in December 1983. 1.3 Coordination Streams requiring detailed and approximate study were identified at a meeting attended by representatives of the study contractor, FEMA, and Garfield County in June 1982.