FLOOD01986

• County: Bent
• Community: Las Animas
• Stream Name: Arkansas River
• Title: Las Animas Local Protection Project Design Memorandum
• Date: 8/22/1968
• Prepared For: Las Animas
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Project

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IV - PROJECT LOCATION, AREA BENEFITED Al~D PROJECT PLAN

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4-01. Project location. The project is located at Las. Animas,
Colorado on the Arkansas River approximately 2 miles. upstream from John
Martin Reservoir and a short dis:ance above the mouth of the Purgatoire
River. Tne location of the project is sho.'h on Plate 1. The. area
protected by the project includes Las Animas and the surrounding
agricultural areas which are subject to inundation. The drainage area
and climatic characteristics are described in SECTION VII, HYDROLOGY AND
HYDRAULIC DESIGN. .

4-02. Area benefited. The area that will be benefited consists of
the City of Las Animas and adjoining agricultural lands. " The area is
about 8.0 miles long from east to west with a maximum width of about 2.5
miles at Las Animas. The area includes approximately 6,880 acres which
is compos~d of 740 acres classified as urban and suburban, 4,170 acres
of irrigated farmland, 1,110 acres of dry farm' and grazing land, and
860 acres of .waste land and transportation rights-of-way. . The major
portion of the area to be benefited is on the south side of the river.
A portion of State Highway No. 194 and a few cultivated fields on the
north side of the river will also be benefited. The estimated. value of
property and improvements in the protected area is about 36 million.
dollars. Additional information regarding benefits in the area is in-
cluded in SECTION XVI, ECONOMIC EVALUATION..

4-03. Project Plan. The rpoject plan for providing flood protection
for the City of Las Animas and vicinity comprises ~ levee. 9.34 miles in
length along the right bank of the Arkansas River and a levee 1.03. miles
long on the left bank. the levees' are designed to contain flows up to
140,000 c.f.s. with 4 feet of freeboard. A general plan of the project
is shown on Plate 1. Aerial views of the project area are shown on
Plates 2 and 3.

4-04. Appurtenant works. Appurtenant work~ wduld include levee
protective measures, interior drainage structures, and a gravity.drain
through the levee for disposal of effluent from existing se',age lagoons.
Relocations would include alterations to a railroad bridge by the Federal
Government and roads, utilities, irrigation facilities,and a railroad
grade raise by local interest. Engineering features of the plan are
described in subsequent sections of this memorandum.

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Revised 6-26-69

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