WSP00945

• File Number: 8442.400
• Description: Missouri Basin - Pick Sloan Project - Reports
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 2/28/1985
• Author: DoI, BoR
• Title: Lake Andes - Wagner Unit Planning Report / draft Enviromental Statement
• Water Supply Pro - Doc Type: Report/Study

Plan is econo~ically justified without the additional livestock benefits.
Therefore, no reformulation of alternative plans was made. Additional
studies are underway to determine if there is justification for inclusion
of additional livestock benefits in the benefit analysis. lnclusion of
additional livestock benefits would enhance the economic feasibility of the
project. The Preferred Plan is the only acceptable and supportable plan by
the project sponsors and the State of South Dakota, and is considered to be
the plan that reasonably maximizes net NED benefits.

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The Preferred Plan

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The Preferred Plan for Lake Andes-Wagner Unit would irrigate 45,000 acres

with water pumped from Lake Francis Case behind Fort Randall Dam on the

Missouri River and provide a fish rearing impoundment on Lake Francis Case

for enhancement. The plan also includes mitigation measures to compensate

for unavoidable wildlife habitat losses which would be caused by develop-

ment of the project. The location of the lands and major features of the

project are shown on the frontispiece map.

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Lands to be Served

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The major portion of the irrigable area is part of a gently undulating
upland plain which ranges in elevation from about 1390 feet above mean sea
level to slightly above 1500 feet. (See Lands in Chapter 2.) There is a
gentle overall gradient toward Choteau Creek and its tributaries over most
of the unit. Lands near the lake drain into Lake Andes, and that part of
the unit situated south of the town of Lake Andes drains into Lake
Francis Case.

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The study area encompassed over 100,000 acres. A total of about

55,000 acres were signed up by landowners, interested in irrigation

service - 28,000 south and east of Lake Andes, 4,000 northwest, and 23,000

east of Choteau Creek. This includes about 2,600 acres owned by members of

the Yankton Sioux Tribe. Of the signed-up lands, about 45,000 acres would

be served - 26,300 acres west of Choteau Creek and 18,700 east of

Choteau Creek. This includes 1,700 acres (3.8 percent of project lands)

owned by the Tribe.

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