Payette enterprise. (Payette, Canyon Co., Idaho) 1909-1935, 1915-09-09
DAM
HIGHEST IN WORLD
COMPLETION TO BE DEDICATED
HANDLING OF LOGS PRESENTS
kNoTTY PROBLEM FOR soLU-
TON.

Boise, Ida, Sept. S.-Aboye Arrow.
rock dam in the basin of the Boise
river it is estimated that there is
,0o0,000,00O feet of merchantable
timber. Sawed into lumber worth,
say $12 thousand, this would rep
resent value of $36,0OO,0OO. 1t is
owned by the United States govern
mont, the Boise Payettc Lumber
Company and number of others
with smaller holdings.
This timber is to be cut in the
immediate future, driven down the
Boise river and converted into lum-
Der at the mills IA miles below the
Arrowrock dam and just outside the
city of Boise.
Here at the big dam, then, is
presented a knotty little problem
to lift these logs from the reservoir,
carry them over the crest 260 feet
above the bed of the river, and de-
liver them in good condition in the
stream below.
Nothing would be permitted Of
course to interfere with the main
object of the dam,-the fmpounding
of the 244 900 acre-feet of water
demanded for the irrigation of 240,-
900 acres of rich soil in the Boise
Valley. But as the dam backs the
water for distance of IS miles, con-
vertimg the river channel into a
reservoir, and including both branch
es of the stream, 1t provides ideal
means for the driving of logs. 1t
was early agreed that some scheme
must be devised for lifting them
over the dam.
Under the direct supervision of
Engineer Charles H. Paul his assist
ant, Walter R. Young, designed an
equipment based ON principals used
where scientific logging is done.
This has a maximum capacity OF
60 ,O00,0 900 feet for the period of 6OI
days In summer when the water in
the reservoir is within as feet or
less of the top of the dam. At this
rate it is estimated that it will
take so years to lift over the entire
8 ,OOO, 900 900 feet.
BY this equipment located at the
extreme southern end of the dam
logs of any size Or length will bel
taken out of the reservoir by means
of a cable lift and deposited on the
concrete deck on the top of the
dam. From this deck they will bel
fed by a stop and loader to power
driven spiked rolls one at time,
the speed under the control OF the |
operator. These rolls will carry tie
logs across the dam and turn them
over to a bull-chain with spurs or
teeth to prevent sliding. The chain
will take them down 62.5 per cent
slope at speed of IS feet minute
md discharge them into a gravity
,hute through which they will slide
nto the river below.
AS this structure must Withstand
he elements for many years 1T is
,uilt of the best concrete and steel.
t is unique in government construc-
ion. Power for its operation is now
developed by the government at
he diversion dam IL miles below.
later power plant is to be estab-
ished at Arrowrock Immediately
tnder the dam.
This dam, the highest In the world,
4S.5 feet from the bottom of the
oundation to the crest, is to be dedi-
ated with a barbecue and harvest
ONE in Boise, Oct. 4. 1t is finish
d more than year In advance of :
be time specified at the beginning G
nd at a cost of $4,000, 900 less than a
he estimates. By storing water this L
eason, the driest In history, it saw q
d the crops ON 100000 acres and 9
ractically paid for itself. c