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FLOOD INSURANCE STUDY CITY OF FORT COLLINS, LARIMER COUNTY, COLORADO 1.0 INTRODUCTION LI Purpose of Study This Flood Insurance Study revises and updates a previous Flood Insurance Study for the City of Fort Collins, Larimer County, Colorado, This information will be used by the City of Fort Collins to update existing floodplain regulations as part of the Regular Phase of the National Flood Insurance Program (NFIP). The information will also be used by local and regional planners to further promote sound land use and floodplain development. In some States or communities, floodplain management criteria or regulations may exist that are more reslrictive or comprehensive than the minimum Federal requirements. In such cases, the more restrictive criteria take precedence and the State (or other jurisdictional 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 Protection Act of 1973. The hydrologic and hydraulic analyses for the original study were performed by Gingery Associates, Inc., for the Federal Insurance Administration (FIA) , under Contract No. H-40l7, This work, which was completed in October 1977, covered all significant flooding sources affecting the City of Fort Collins. The hydrologic and hydraulic analyses for the Cache La Poudre River were reanalyzed by the U,S, Department of the Army, Corps of Engineers (USACE), Omaha District The data were compiled by Simons, Li & Associates, Inc., for the Federal Emergency Management Agency (FEMA), under Contract No. EMW,86-C-2262, The revised analyses were for the reach of the Cache La Poudre River from Horsetooth Road upstream to the south end of Watson Lake. This work was completed in May 1994. For the Cache La Poudre River ' Interstate Highway 25 Divided Flow area, the hydrologic analyses were performed by the USACE, Omaha District (Reference 1), and the hydraulic analyses were performed by Simons, Li & Associates, Inc., under Contract No, EMW-86-C-2262, for FEMA. This work was completed in August 1990. The hydrologic and hydraulic analyses for Cooper Slough were performed by Love & Associates, Inc., for FEMA, under the Limited Map Maintenance Program (LMMP), Contract No, EMW-90-C313. This work was completed in November 1993, Revisions to Spring Creek were completed in 1993. The revisions to the hydrologic and hydraulic analyses were completed for the City by various engineering consultants, These data were submitted by Foothills Engineering Consultants, Inc" for FEMA, as a LMMP contract The hydraulic analysis for the Boxelder Creek Overflow Channel downstream of County Road 50 (CR-50j' was performed by the U.S. Department of the Interior, Bureau of Reclamation (USBR), for FEMA, under Interagency Agreement No, EMW-88-E.2765,