FLOOD09193

• Designation Number: 579
• County: Gunnison
• Community: Marble and Vicinity
• Stream Name: Crystal River
• Basin: Gunnison
• Title: Floodplain Information Report - Crystal River - Marble and Vicinity
• Date: 8/1/2004
• 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 Floodplain Information Report provides new and revised information on
the existence and severity of flood hazards along the Crystal River, in the
geographic area of the Town of Marble and in unincorporated portions of
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. This report may also be used by FEMA as an existing data study
(XDS) for future Flood Insurance Study revisions.

1.2 Authority and Acknowledgments

The source of authority for this Floodplain Information Report is the Colorado
Water Conservation Board under Contract Numbers CI53924 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 Floodplain 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.
August 2004

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