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FLOOD INSURANCE STUDY 1.0 INTRODUCTION 1.1 Purpose of Study This Flood Insurance Study report has been prepared to revise and update a previous Flood Insurance Study for the City of Glenwood Springs, Garfield County, Colorado. This information will be used by Glenwood Springs 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 analyses of the Roaring Fork and Colorado Rivers were performed by the U.S. Army Corps of Engineers, Sacramento District, for the 1977 Garfield County, Colorado, Flood Insurance Study (Reference 1) and provided to Gingery Associates, Inc., for use in preparing the hydraulic calculations for these streams. The hydraulic calculations on the Roaring Fork River and the Colorado River downstream of the confluence with the Roaring Fork River were provided by the Colorado Water Conservation Board (Reference 2). The hydraulic calculations on the Colorado River upstream of the confluence of the Roaring Fork River were performed by Gingery Associates, Inc., under Contract No. H-4017. This work, which was completed in January 1978, covered all significant flooding sources affecting the City of Glenwood Springs. Hydrologic and hydraulic analyses for Threemile Creek and revised analyses for the Roaring Fork River upstream of the abandoned Cardiff Bridge were performed by Simons, Li and Associates, Inc., for FEMA under Contract No. EMW-C-0942. These analyses were completed in December 1983.