The Caldwell tribune. [volume] (Caldwell, Idaho Territory [Idaho]) 1883-1928, 1911-01-27
The Big dam
Will COST MONEY
ESTIMATES ON ARROW ROCK
DAM INCLUDE COST OF
RAILROAD TO SITE.


to Add Materially to the Cost of the
Project
Appended to and made part OF the
report Of the board of army engineers
on government irrigation projects, is
a discussion of the proposed storage
works connected with the Payette-
Boise project, and especially the dams.
AS the department has decided to
build on the Arrow Rock site since
the board made its report, figures on
that structure alone are quoted. The
board says:
The committee visited both of the
possible dam sites for the proposed
He'll Gate reservoir, i. e.: At Hell
Gate and at Arrow Rock. 1t APP
pears from the examination of data
collected by the United States recla-
nation service that a masonry dam
can be constructed at either site to
store 10000 acre feet (the capacity
proposed), but that the lower CAR
row Rock) site has some points OF
superiority. The estimated cost OF
the dam at the two sites is practically
the same, and each provides for the
storage of 10000 acre feet. The
He'll Gate dam would have maxim
um height of 303 feet, raising water
212 feet, and the Arrow Rock dam
would have a maximum height of 3l8
feet, raising water 2l2 feet The chief
points of superiority of the Arrow
Rock over the He'll Gate site are the
better quality of the granite on which
the dam is to be founded, the lesser
average of thickness of the overlay-
ing materials in bed of stream, the les
ser extent of the volcanic Gaping
the somewhat more accessible site
and the slightly lesser cost.
The cost of storage on the Boise
river will be high, but the examina-
tons of the reclamation service indi-
cate that it will be less for the He'll
Gate reservoir with dam at Arrow
Rock) than for any other site or sites
on the river Even this site requires
high masonry dam, which must be
constructed of gravity section On
account of the depth of rock in the
bed of the stream much difficulty may
be expected in the construction of
that portion of the dam below low
water level.
The following estimates are sub
mitted by the United States reclama-
ton service:
One hundred and fifty thousand
acre feet storage; rubble masonry
dam, type A; raising water 2l2 feet;
dam 3l8 feet high; crest elevation,
1880; flooding 2O50 acres; watershed
area, 2208 square miles:
Railroad, Barberton to Ar
row Rock, II miles at
$4,000 :. -. =. =. IS $4,000
, Pant -. :. :. -, -. . 100000
Freight, exclusive of &C.
ment, sand and gravel. 25,OW
Tunnel, 900 linear feet, at
$50 =, -. -. 72,OOt
Gates, 100000; cofferdam,
$l5o,OO0 =. go. $4,000
Excavation in cofferdam-
2l,000 cubic yards
solid rock at So $4,000
$4,000 cubic yards
gravel and bowl
ders at 81, .286OO0
$4,000
Excavation above water for
dam foundation
$1,000 cubic yards
solid rock at $l10, $4,000
10000 cubic yards
earth and loose
rock at 60c. -. 5000
63OOC
Bubble masonry in dam,
$4,000 cubic yards at
$o.25 ..... go. 100000
Spillway =. =. 100000
lncidentals, 10 per cent of
above items :. =. 100000
Engineering and admins
tration ..... :. 49,. 100000
Total cost ,...#.. -. ..$5l5oOOOI
Cost per acre foot for 10000 acre
feet, $3439
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