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 Study was completed on October 31. 1985 on behalf of the
City of Alamosa and Alamosa County in cooperation with the
Colorado Water Conservat ion Board. The Feasibility Study
identified a conceptual plan of improvement which was divided
into four project phases at an estimated cost of $6.5 million.
This cost estimate includes construction. contingencies.
engineering. and administration. These improvements are
estimated to reduce average annual flood losses in the area to
approximately $63.315/year. This is an annual benefit to the
community of about $984.385 per year. The benefit/cost ratio is
estimated between 2.5 and 3.0.

Emergency funds from the Division of Disaster Emergency Services
following the 1985 State Emergency Declaration were used in
conjunction with previously obtained block grant funds and
energy impact funds from the Division of Local Affairs and local
money to provide sufficient funds to initiate certain phases of
the flood control project. Technical design expertise was
provided by Muller Engineering. the Corps of Engineers and the
Colorado Water Conservation Board. The Colorado Water
Conservation Board also served as project coordinator.

The Alamosa Flood Control
completed in the following
technical advisory committee.

Project
sequence.

improvements are being
as recommended by the

Phase 1- U.S. 160 Bridge to D&RGWRR

a. Clear vegetation and sand bars out of the river channel.

b. Rehabilitate and install riprap armor on levee near the
golf course.

c. Reconstruct levees along East Alamosa between U.S. 160
and the D&RGWRR.

Phase 11- State Street Bridge to U.S. 160 Bridge
a. Construct improvements adjacent to Cole Park.

b. Raise the north levee and install riprap at the bend in
the river on the north levee and upstream of the bend
on the south levee. between State Avenue and U.S. 160.

Phase 111- Upstream Limit (Riverwood Estates) to State Street
Bridge

b. Upgrade and raise levees throughout reach to provide
adequate freeboard and stability control.

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