PUB00077

• Year: 1987
• Title: Construction Fund Annual Report 1987
• CWCB Section: Finance
• Author: CWCB
• Description: Construction Fund Annual Report 1987
• Publications - Doc Type: CF Annual Report

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COLORADO WATER CONSERVATION BOARD
721 State Centennial Building
1313 Sherman Street
Denver, Colorado 80203

Comanche Reservoir
(City of Greeley)

Introduction

Comanche Reservoir is one of the larger high elevation, raw
water storage units owned by the City of Greeley. It is
located on Beaver Creek approximately 9 miles south of Rustic
in Larimer county. The dam for this reservoir is an earth
embankment with a maximum height of 40 feet and a crest length
of 1,500 feet. It impounds a reservoir, when full, of 2,600
acre-feet.

Problem

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In January, 1986, the State Engineer restricted storage in
Comanche Reservoir to 1,660 acre-feet due to excessive
embankment seepage and the potential for piping of foundation
materials. Being able to maintain storage in this reservoir to
its maximum capacity is vital to the city's winter water system
operations, as well as for assuring an adequate water supply
during a drought. For these reasons, the city had a
feasibility study performed to determine the best solution to
this problem. The study was done by Morrision-Knudsen
Engineers, Inc.. of Denver, and is the basis for the
recommendation on this project.

Proposed Proiect

After studying several alternatives for the rehabilitation
of Comanche Dam, the consultants selected the alternative that
would raise the dam crest by 6 feet to route the probable
maximum storm, construct a split level overflow spillway with
roller compacted concrete. repair and extend the existing
outlet works, replace the existing outlet works hourglass
structure, repair and/or reinforce the existing riprap, and
control and collect the embankment and foundation seepage. The
estimated cost of this project is $1,725,000.

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