FLOOD11039

• County: Grand
• Community: Grand County and Incorporated Areas
• Basin: Colorado Mainstem
• Title: FIS - Grand County and Incorporated Areas
• Date: 1/2/2008
• Prepared For: Grand County
• Prepared By: FEMA
• Floodplain - Doc Type: Current FEMA Regulatory Floodplain Information

FLOOD INSURANCE STUDY
GRAND COUNTY, COLORADO AND INCORPORATED AREAS

1.0 INTRODUCTION

1.1 Purpose of Study

This Flood Insurance Study (FIS) revises and updates information on the existence and
severity of flood hazards in the geographic area of Grand County, Colorado, including the
Towns of Fraser, Granby, Grand Lake, Hot Sulphur Springs, Kremmling, and Winter Park;
and the unincorporated areas of Grand County (referred to collectively herein as
Grand County and Incorporated Areas), and aids in the administration ofthe National Flood
Insurance Act of 1968 and the Flood Disaster Protection Act of 1973. This study has
developed flood-risk data for various areas of the community that will be used to establish
actuarial flood insurance rates and to assist the community in its efforts to promote sound
floodplain management. Minimum floodplain management requirements for participation in
the National Flood Insurance Program (NFIP) are set forth in the Code of Federal
Regulations at 44 CFR, 60.3.

Please note that the Town of Kremmling is non-floodprone.

In some States or communities, floodplain 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 jurisdictional
agency) will be able to explain them.

1.2 Authority and Acknowledgments

The sources of authority for this PIS are the National Flood Insurance Act of 1968 and the
Flood Disaster Protection Act of 1973.

Parts of the hydrologic and hydraulic analyses for this study were performed by J.F. Sato
and Associates for the Federal Emergency Management Agency (FEMA), under Contract
No. EMW-83-C-1165, which was completed in May 1984.

Safeway, Inc., completed construction of a new grocery store along the Fraser River in the
Town of Fraser in April 1999. A Letter of Map Revision (LOMR) to reflect the effects of
this project was issued on October 31,2000 (Case No. 00-08-114P).

Hydraulic analyses for the Fraser River were performed by Galloway, Romero & Associates
(GRA) in September 1997 to insure that the proposed Safeway store was placed outside the
IOO-year flood limits and above the Base (l-percent-annual-chance, or IOO-year) Flood
Elevation (BFE) for the Fraser River. Some fill was placed in the 1 DO-year floodway fringe
in association with the development.

The hydraulic analysis for the Fraser River prepared in September 1997 by GRA was
updated in November 1999 based on as-built survey data.

In July 2000, the Colorado Water Conservation Board (CWCB) completed a limited-detail
study ofa portion of the Fraser River and three tributary streams to the Fraser River.

In February 1987 the CWCB completed a study of a portion of the Frasier River and
Tenmile Creek through Granby, Colorado.