Catoctin clarion., 1911-03-23

river around the dam. Later it will
serve as sluicing or securing tunnel
to remove silt from in front of the
dam. In this tunnel are installed six
gates, one set for service and one for
emergency, each with an opening OF
49x9 feet.
The second opening in the dam is
a riveted stock 10 feet in diameter
which comes out on the down stream
side at an elevation of about 25 feet
above the power house.
The third opening near the north
end of the dam consists of three lines
of five-foot cast-iron pipe passing from
the up stream face through the ma
sonry. At the junction of the masonry
and the natural rock these converge
into lined tunnel 8 feet in diameter
which discharges out of the face of
the cliff about 100 feet below the dam.
Just below the dam is power
house 125x3S feet in which are in
stalled six 5. Morgan Smith vertical
turbines, each operating al 900 kilo-
watt General Electric 2,3O0 volt, 25
cycle generator with Lombard govern
or. In addition two EXETER machines
and two Pelton wheels are in opera
ton. A short distance down stream
is the transformer house, where the
current is transformed to 45, 900 volts,
thence passing to siX-wire trans
mission line on galvanized steel tow
crs leading through the mountains
and across the desert to Mesa and
Phoenix. For more than a year
Phoenix has been lighted from this
plant.
Under the provisions of the Rccla-
nation Act this power development
is made a part of the project and in
time will be transferred to the land
owners, who will then operate it for
their mutual benefit and profit The
revenue 50 derived should lessen ma
trrially, if it does not wholly meet,
the expenses of operating the entire
irrigation system.
Tue construction of tn" Roosevelt
Dam has had most rigid supervision.
Every rock has been washed clean
before being sci in place. The cement
has been carefully tested at regular
intervals.
On September 10Th, 1906, the first
stone was laid, and ON February 9th,
1911, the masonry work was com
pletpd. The cost of the dam has brrH
a little over So, 5OO,O 900.
The chief purpose of the structure
is to store the flood waters Of Salt
River and its tributary, Tonto Creek,
which Join just above the dam. The
storage reservoir has a capacity Of
| PSI 900 acre. feet, or water enough
to cover that many acres Il foot deep.
The water shed supplying this rrscr-
voir has an area OF }, 500 square miles
or area almost equal to that Of Con-
ntcticut and Rhode Island.
As the reservoir is located sixty
miles from the land to bc irrigated,
the river will be used as a carrying
canal for that distance, and the water
will then be turned into artificial
canals by diversion dam which has
been built at Granite Reef. This is
a rubblc concrete weir 3S feet high
and |, 100 feet long, and divrrts the
water into two large canals, which in
turn supply the entire irrigation Sys
tom of the Salt River Valley. The
canals of the valley have Il total length
of 10 miles, and the principal later
ais DOS miles. They are designed to
supply an area of 24O, 600 acres, of
which 100000 acres will be covered
by gravity and $4,000 by pumping.
SALT RIVER VALLEY.
Salt River Valley includes several
million acres of land with soil of
superior fertility and a climate warm
and arid. This produces Il region Of
remarkable healthfulness and adapted
to the production of crops ranging
from those of the emi-tropc to those
OF the temperate zone. Its average
rainfall is only five inches, and it's
average temperature is 50 degrees.
Without irrigation no crops can be
grown, but with it crops grow through
out the year.
AS a whole, the citizens of the val
ley are made up of a strong, intelli-
class who have come from all parts of
the Union. They are cosmopolitan
and progressive. In points of civic
pride and social ideals the communi-
tu rnnEs hirh pnunrtu IL nran ina llu