FLOOD00067

• County: Alamosa
• Community: Alamosa
• Stream Name: Rio Grande River
• Title: Flood Control Status Report for Alamosa County and City
• Date: 7/1/1987
• Prepared For: Alamosa County
• Prepared By: CWCB
• Floodplain - Doc Type: Project

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The Phase I design also allowed some of the existing levee fill

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material to be used
fill materiaL Also
for maintenance to
constructed and that
to the levee crests.

in the new levees thus saving costs for
included in the design was the provision
be performed regularly for improvements
maintenance access would be made available

The ci ty and County of Alamosa, Colorado Water Conserva t ion
Board, U. S. Army Corps of Engineers, Division of Disaster
Emergency Services and other~ reviewed the Phase I Preliminary
Design and authorized Muller Engineering to proceed with final
design and contract documents.

On August 28, 1986, the City and County accepted bids for
construction of the Phase I levee system along East Alamosa
between U. S. 160 and the D&RGWRR. The construction contract
was awarded to Southway Construction of Alamosa. The Phase I
construct ion of the levees, was completed during December of
1986.

4,3 ALAMOSA CITY AND COUNTY ACTIONS TAKEN DURING 1987

During January of 1987, Alamosa City and County authorized
Muller Engineering Co. Inc. to proceed with a portion of the
Phase II design of the west bank levee system on the Rio Grande
from U.S. 160 to the north boundary of Cole Park.

The purpose of the Phase II design was to define anticipated
construction costs and address three main problems with the
existing levee system - seepage through and instability of the
west bank earth levee, erosion protection of the levee face,
erosion protection of the levee face, and impacts to the east
bank levee (where no work was proposed as part of the Phase II
construction) caused by improvements to the right bank levee.
Also of major concern is the condition of the Cottonwood trees
within Cole Park and how the construction will affect the' life
expectancy of those trees.

A major importance to the Phase II design was the geotechnical
study by Chen and Associates, the surveying of existing ground
conditions by Knapp Engineering and Surveying Services, and an
evaluation of the life expectancy of the Cottonwood trees along
the levee in Cole Park the Colorado State University Extension
Service,.

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