FLOOD03181

• County: Weld
• Community: Greeley
• Stream Name: Cache La Poudre River
• Basin: South Platte
• Title: Master Floodway Plan
• Date: 8/1/1983
• Prepared For: Greeley, CWCB
• Prepared By: Simons Li & Associates Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

I
I

_'____m___
I
I
.Page I
66 I
67
68 I
69
I
I
I
I
I
I
I
I
I
I
I
I
I
I
L
-----------

LIST OF FIGURES (continued)

I

I

Figure 23. Preliminary design - profile.
Figure 24. preliminary design - profile.
Figure 25. Preliminary design - profile.
Figure 26. TYpical improved channel cross section.

I

I
I
I

I

I
I

I

I

I

I

I

I

I

x

I

INTRODUCTION

Authority

This report was authorized and contracted through the City of Greeley,

Colorado (City) to develop preliminary designs for improvements to the Cache

1.

la Poudre River within the City. Simons, Li & Associates, Inc. (SLA) was

selected by the City as the Study COntractor according to the terms of the

agreement signed April 5, 1983.

Purpose and Scope of Work

This master floodway plan has been prepared to guide local officials in

planning the use and regulation of the Cache la Poudre River floodway within

and adjacent to the City. The master floodway plan is designed to minimize

flooding impacts within the floodway area. The purpose of a floodway is to

designate those areas to be kept free from future encroachment and reserve an

area for conveyance of the 100-year flood along the Cache la Poudre River.

The work for this study includes hydraulic analyses (including the veri-

fication of previous hydraulic analyses), development of alternative plans of

improvement, and preliminary design of the improvement alternative selected by

the City. Also included are analyses of river stability and sedimentation.

Floodway maps have been prepared and are available for review at the City of

Greeley Planning Department Offices.

Available Data and Previous Reports

Several reports have been prepared that contain information relevant to

this study. These are:

"Floodplain Information Study, Cache la Poudre River, Greeley, Colorado,"
1971, prepared by the U. S. Army Corps of Engineers, Omaha District.

"Reconnaissance Report, Section 205, Cache la Poudre River, Greeley,
Colorado," 1981, prepared by the U.S. Army Corps of Engineers.

"Flood Insurance StUdy, City of Greeley, Colorado," 1979, prepared by the
Federal Insurance Administration.

"Flood Insurance Study, Weld COunty, Colorado," 1982, prepared by the
Federal Emergency Management Agency.