FLOOD10349

• County: Gunnison
• Community: Marble and Vicinity
• Stream Name: Crystal River
• Title: Floodplain Information Report - Crystal River - Marble and Vicinity
• Date: 5/1/2004
• Prepared For: Marble and CWCB
• Prepared By: ICON Engineering, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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1.0 INTRODUCTION

1.1 Purpose of Study

This Flood Information Report revises and updates information on the
existence and severity of flood hazards along the Crystal River, in the
geographic area of the Town of Marble and Unincorporated Gunnison
County, Colorado (Plate I). This study has developed flood risk data that
will be used to assist the County and the Town of Marble in its efforts to
promote sound land use management and regulation of floodplain
development.

1.2 Authority and Acknowledgments

The source of authority for this Flood Information Report is the Colorado
Water Conservation Board under Contract Numbers C153924 and
CI53986 with ICON Engineering Inc. to perform hydrologic and
hydraulic analysis to complete a floodplain delineation study on the
Crystal River within Gunnison County, Colorado. According to Section
37-60-106(1)(c) of the Colorado Revised Statutes, the Colorado Water
Conservation Board has the power and duty "... to devise and formulate
methods, means and plans for bringing about the greater utilization of the
waters of the state and the prevention of flood damages therefrom...."

1.3 Coordination

During the preparation of this Flood Information Report for Gunnison
County and the Town of Marble, the following public and private entities
were contacted and were instrumental in the preparation of this report;
Colorado Water Conservation Board (CWCB); Gunnison County; Town
of Carbondale; U.S. Geological Survey (USGS); Marble Historical
Society and Museum; ICON Engineering, Inc.; and Kucera International,
Inc. Specifically, the CWCB, USGS, and Gunnison County supplied
information used in the preparation of this report.

A general historical information search was coordinated with the Marble
Historical Society and Museum for historical background information,
available publications, and photographs of past floods. Much of the
information presented in this study was obtained from the Town of Marble
website (Reference I).

The USGS was contacted to obtain historic stream gage data.
Additionally, the flood frequency analysis program PEAKFQ (Reference
2) was obtained from the USGS and used for developing flood discharges
for this study.

The Gunnison County Planning Department provided mapping of the
Crystal River study reach (Reference 3).

ICON Engineering, Inc.
May 2004

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