FLOOD09052

• County: Routt
• County: Moffat
• Basin: Yampa/White
• Title: Dam Failure Floodplain Information for the Yampa River Downstream of Stagecoach Reservoir
• Date: 12/1/1989
• Prepared For: Moffat County / Routt County
• Prepared By: CWCB
• Floodplain - Doc Type: Flood Documentation Report

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

1.0 Introduction

,

The Upper Yampa Water Conservancy District
completed construction of Stagecoach dam in 1988.
of its purposes is the generation of hydroelectric

One
power.

Section 12.20(a) of the Federal Energy Regulatory
Commission (FERC) regulations requires that every
applicant for a license for hydropower generation must
develop and file an Emergency Action Plan (EAP) with
the Regional Director unless granted a written
exemption. An important element of such a plan is
the preparation of dam failure inundation maps which
are required for all high and significant hazard dams.

The purpose of this report is to document the
investigation on the extent of flooding that would
result should the dam fail for some reason. This is
not intended to reflect upon the integrity of the dam.

The flood boundaries, depths, and travel times shown
in this report will be essential in developing an
effective Emergency Action Plan for use by local
governments in the area. The potentially impacted
, communities are listed below:

City of Steamboat Springs

Routt County - including the unincorporated
areas of Milner and Mt. Harris

Town of Hayden

City of Craig

Moffat County

including the unincorporated
areas of Juniper Hot Springs.
Maybell, and Sunbeam

This revised analysis incorporates review comments
on the Emergency Action Plan made by FERC in a letter
dated November 30, 1988 concerning the assumed size of
the breach in Stagecoach dam.