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I I I I I I I I I I I I I I I I I I I PREFACE The Floodplain Information Report (FIR) is part of a program by the Colorado Water Conservation Board (CWCB) to aid communities in Colorado in the use of the regulatory floodplain maps prepared by the Federal Emergency Management Agency (FEMA) in the community. This Floodplain Information Report provides updated information of floodplain delineations on existing FEMA maps. In addition, it provides floodplain management information to guide the local governments in the use of the maps. Regulated floodplains for Hinsdale County is described and mapped within the Flood Insurance Study (FIS) and on the Flood Insurance Rate Map (FIRM), respectively, both dated September 1987. A small part of FIRM Panel No. 08053C0125 B was updated through the Letter of Map Amendment (LOMA) process by FEMA dated August 1998. The PIS and FIRM define floodplains for portions of Lake Fork Gunnison River (Lake Fork) and Henson Creek in the vicinity of Lake City using hydraulic analysis. The FIRM identifies approximate floodplains for portions of Lake Fork, Henson Creek, Cebolla Creek, Mineral Creek, Spring Creek, North Clear Creek, South Clear Creek, Rito Hondo Creek, Big Spring Creek, Crooked Creek, Rio Grande River, Little Squaw Creek, Squaw Creek, Weminuche Creek, Los Pinos River, Middle Fork Piedra River, East Fork Piedra River, Piedra River, Williams Creek, and Weminuche River, a few unnamed tributaries, and numerous reservoirs and lakes. These floodplains were identified using the best information available and were meant to represent floodplain conditions as they existed at the time of the study. The Flood Information Report for Hinsdale County summarizes updated floodplain mapping and supporting information to replace floodplain delineations in the 1991 FEMA study. It includes a description of available hydrologic information for major flooding sources within the County and, for CWCB designation purposes, supersedes the FIS and the FIRM. In addition, this document provides basic information about floodplain management and possible alternatives to formulate and implement floodplain management objectives. The floodplain information in this document meets the basic technical requirements for designation and approval by the CWCR Colorado statutes require local governments obtain from the CWCB the designation and approval of floodplain information for their use in regulatory purposes. This document provides a means for the FIS and the FIRM to meet that statutory objective. As new and more detailed floodplain information becomes available, floodplain areas shown in this report may change. The CWCB will designate and approve new information, and rescind old information as appropriate. 1