WSP05149

• File Number: 8180.800
• Description: Purgatoire River Project
• Basin: Arkansas
• Water Division: 2
• Date: 9/1/1949
• Author: RJ Tipton
• Title: Engineering Report on Flood Control and Irrigation District with Particular Reference to the Piedmont Bridge Dam and Reservoir Site
• Water Supply Pro - Doc Type: Report/Study

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en in order to provide flood protection for Trinidad, Colorado, and
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\~ u:' at the same time make more water readily available for agricul-
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tural and industrial uses." Five reservoir plans, sununarized

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in Table No.1, were reported on.

Table No.1

General Data on Plans Investigated by Corps of Engineers

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Pl&n
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Reservoir
Capaci ty Total
in Acre- Es tima ted Annual Annual
feet Cost Cost !lene.u.t~
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28,400 (a) $6,684,590 $337,390 :;; 32,250

Ratio of
Costs to
Benefi ts

Sopris Detention
Ree. Plan 1.

l: .0$6

Sopris Detention
Res. Plan 2. 5,200

2,)10,481 42l,047

1: .005

Piedmont Bridge
Detention Res. 31,500

5,333,247 280,210

32,250

l: .115

Piedmont Bridge (b)
Retention Res. 81,500

l4,699,262 663,809 357,003(d)

1: .529

Piedmont Bridge
Retention Ree. (c) 8l,500

l4,699,262

l: .7

,
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...

(a) Limit of economical storage
(b) For flood control and irrigation
(c) Primarily for irl'iGa tion, incidental flood control
(d) Flood benefits $73,642: Irrieation benefits $283,361.

It is readily apparent thIJ.t the only reserVoir plan listed

above which is worthy of consideration is the Piedmont Bridge

Retention Reservoir; therefore, only that reserVoir will be con-

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sidered herein. The Piedmont 3ridge Retention Reservoir as'

studied by the Corps of Engineers had a capacity of 81,500 acre-

feet. Two studies were made of a reservoir of that capacity.

The first had the capacity allocated as follows:

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