FLOOD10330

• County: Summit
• Community: Silverthorne
• Stream Name: Blue River, Straight Creek, Willow Creek
• Title: Flood Insurance Restudy, Technical Support Data Notebook, Silverthorne, Summit County, Colorado
• Date: 1/16/1998
• Prepared For: Silverthorne
• Prepared By: Army Corps of Engineers
• Floodplain - Doc Type: Floodplain Report/Masterplan

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DRAFT FIS REPORT DATA

FLOOD INSURANCE STUDY

1.0 INTRODUCTION

1.1 Purpose of Study

The purpose of this Flood Insurance Study is to investigate the existence and severity
of flood hazards in the Town of Silverthorne, Summit County, Colorado, and to aid in the
administration of the National Flood Insurance Act of 1968 and the Flood Disaster
Protection Act of 1973. Initial use of this information will be to convert Silverthorne to
the regular program of flood insurance by the Federal Insurance Administration. Further
use of the information will be made by local and regional planners in their efforts to
promote sound land use and flood plain development.

1.2 Coordination

Community base map selection and the identification of streams requiring detailed
study was accomplished in a meeting attended by representatives from the Federal
Emergency Management Agency, the study contractor, the Colorado Water Conservation
Board, and the Town of Silverthorne on February 6,1997. Summit County also provided
assistance in gathering information for this report.

During the course of the study, hydrologic procedures, flood elevations, flood
boundaries, and floodway delineations were reviewed with officials of Colorado Water
Conservation Board and the Federal Emergency Management Agency.

The final community coordination meeting was held on (pending), and was attended
by representatives of the Federal Emergency Management Agency, the study contractor,
and the Town of Silverthorne. All problems raised at the meeting were resolved in this
study.

1.3 Authority and Acknowledgements

The source of authority for this Flood Insurance Study is the National Flood
Insurance Act of 1968, as amended.

Simons & Associates, Inc., under contract to the Federal Insurance Administration
(Contract No. EMD97-CO-0031), performed the hydrologic and hydraulic analyses for
this study. This work, which was completed in October 1998, covered all significant
flooding sources affecting the Town of Silverthorne.

2.0 AREA STUDIED

2.1 Scope of Study

This Flood Insurance Study covers the incorporated area of the Town of Silverthorne,
Summit County, Colorado. The area of study is shown on the Vicinity Map (Figure 1).

The following streams were studied in detail: Blue River within the corporate limits;
Straight Creek, from the upstream corporate limits to its confluence with the Blue River;
and, Willow Creek, from west of the upstream corporate limits to its confluence with the
Blue River (beyond the downstream corporate limits).