WSP09882

• File Number: 8410.300
• Description: Platte River Basin - Basin Multistate Organizations - Missouri Basin States Association
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 6/22/1961
• Author: Corps of Engineers
• Title: Mid-Year Review for 1961 - Missouri River Project Operations - Corps of Engineers - Missouri River Division
• Water Supply Pro - Doc Type: Report/Study

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This is shown in the following table giving actual 'lmter in storage in

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the main stem reservoirs for each of the last eight yeFU's, as new storage

capacity has progressively become available with the advance of' construction

of these projects:

December 31, 1960

Storage Conditions in Millions of Acre-Feet

Actual Water
in Storage

1953
1954
1955
1956
1957
1958
1959
1960

Storage Capacity Available
(exclusive of flood control)

14.2
14.6
13.6
14.0
20.0
20.9
24.4
26.8

15.9
22.6
31.3
31.8
34.9
36.7
37.3
38.0

The of':ficial records of the Corps of Engineers sho~T that at midnight on

April 30, 1961, the main stem reservoir system contained a total of 27,210,000

acre-feet of water. The average annual flow of the Missouri at Sioux City,

Iowa, is 24t million acre-feet. Thus, more than a full year's average flow

of the river is now stored behind the main stem dams. Hhen all six main stem

dams are completed and in operation they will have a combined gross storage

capacity of 76 million acre-feet, of' which about 16t minion acre-feet will be

reserved for flood control.

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These records also show that on December 31, 1960, over 70 percent of

the inactive and conservation storage space then available for filling was

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actually filled with water.

A brief review of the situation at the individual reservoirs is pertinent.

Fort Peck Dam in Montana was first filled to normal operating levels in the

early 1940 t s, remained there 1.ll1til storage was pulled d01ffi in 1954 and 1955.

to help fill the inactive storage and start power generation at Fort Randall

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