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All over the world the development of Rivers
has always been part of man's progress

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is conquest of rivers

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and his improvement of them for his own
use straighted by the rivers of our own

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west.

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Let's consider the four main rivers of the
Pacific slope to see for ourselves how

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important they are

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and how they have been made useful to
the people of the western United States

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in the northwest.

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The Columbia River has played a vital
role in the development of Washington

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and Oregon.

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The Sacramento

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and San Joaquin rivers are equally
important to the Great Central Valley of

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California.

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And the Colorado River is of dry Mendis
value to seven states in our Southwest.

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Starting with the Columbia. Let us
look at each of the four others.

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That Columbia five miles wide at its
mouth is deep enough to carry big ocean

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vessels upstream for a
distance of one hundred miles.

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As much as ten million tons of freight
are carried each year by ships on the

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Columbia one of the many products
of the Pacific Northwest is lumber.

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Washington Oregon the greatest lumber
producing states in our country from their

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great forests some of the timber is carried
on the Columbia River in the form of

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log rafts small tugs told the rafts to
sawmills on the rivers banks here the logs

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are cut into lumber

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and then loaded into freighters
for shipment down the Columbia

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and out into the Pacific Ocean
to the parts of the world.

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Another valuable product

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that is carried on the great
Columbia waterway is wheat wheat

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that is grown in the Columbia River Basin.

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The Columbia River is
also the home of salmon

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and yields much of the
nation's supply of this faith.

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Salmon are caught in the river

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and also in the ocean along the Pacific
coast about seventy million pounds of

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salmon are caught each year in the Pacific
Coast states from canneries such as this

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salmon are shipped down the Columbia
to many parts of the world.

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Center of shipping

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and commerce on the Columbia is the city
of Portland located on the lam at River a

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tributary of the Columbia.

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One of the new

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or industries along the Columbia is the
refining of aluminum such metal industries

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require a tremendous supply of electricity
which is furnished by Bonneville Dam

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more than a half million kilowatts of
electric energy are produced in Bonneville ZP

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our hearts but dam not only puts the
Columbia River to work producing power

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but it improves navigation by
deepening the river above the dam

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and by providing locks which lift the river
boats from the lower river through the

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higher level above the dam far upstream
deep in the state of Washington.

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But Colombia's fanned by another dam Grand
Coulee one of the greatest structures in

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the world this dam was built
to supply water for irrigation

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and water for power here
is water for power water

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that tumbles down five hundred feet with
tremendous for us to turn the generators

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that produce electricity

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and here is water for irrigation the
vast reservoir held by the dam.

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Eventually this water will be used to
irrigate more than a million acres of land.

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And the spring new world through the
Pacific Northwest irrigation is the

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principal purpose for which man
is developed the Sacramento

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and San Joaquin rivers

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and the Great Central Valley of California
the land in the Central Valley is

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fertile.

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But it needs water to make it productive
to supply this water to great dams were

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completed in nineteen forty four one of
these is just a dam on the headwaters of

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the Sacramento River.

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Some of the water held by this dam comes
from the slopes of Mount justice.

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Although its main function is to store
water just a dam provides flood control

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and is a source of electric power for the
people of the valley it serves the other

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dam in the Central Valley is free on Dam
on the San Joaquin River get supplies

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water to the southern half of the great
central valley from the dam a precious

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water of the center walking river is
carefully distributed through a network of

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irrigation canals booster stations
pump the water to higher canals

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and control Gates regulate the
flow into smaller going out.

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Until the water finally reaches the
fields two million acres of land will

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eventually benefit from the Sacramento
and San Joaquin River Systems.

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Not only have these two rivers made the
Central Valley of California region of

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agricultural well

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but they are also used for commerce
both rivers flow into the Bay of scent

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Francisco and goods from

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that seaport are shipped up the Sacramento
River to the city of Sacramento

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and up the center Joaquin River and
through the inland part of Stockton

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and sold two rivers the Sacramento

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and the San Joaquin are used by man
to increase crops to carry commerce

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and to develop power in the
Central Valley of California.

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The Colorado River is an outstanding example
of a river which man has put through

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his own use.

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From its arson the Rocky Mountains the
Colorado flows south through Utah

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and Arizona much of this
region is dry wasteland.

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And the river at self is normally
shallow and of no use for navigation.

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Yet man has made this river.

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Great about imperial dam on the lower
Colorado diverts the precious water from the

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river into a vast irrigation system
this dam does not store water

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but channels it through
these big roller gates

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and into this this building
Basin after the sand

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and mud settle to the bottom of a clean
clear water enters the all-American going

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out for a hundred miles
this man made canal

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and carries the water of the Colorado
River through the desert of Southern

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California through the Imperial
Valley and the court shall Of out.

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Here the water is carefully directed on
to the land. The result is surprising.

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Land that was once dry and Veron
yields rich crops when irrigated.

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With the help of water from the Colorado.

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The man has created new wells
things Southern California.

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But the Colorado does much more farther
up the river above them aerial dam is

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Parker dam. Parker dam was
built not for irrigation.

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But to divert water for the city of Los
Angeles from this reservoir behind Parker

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dam million gallons of water a day
pass through this pumping station

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and into the Los Angeles aqueduct for
three hundred miles over mountains

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and through the desert the water is
pumped up until it reaches Los Angeles

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and there is still one more project that
man has built to make use of the Colorado.

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That project is Hoover Dam one of the biggest
structures ever made by man to put a

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river to work the great reservoir behind
Hoover Dam is called Lake Mead the

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water is used for irrigation and
to supply the homes and factories

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and cities of southern California Arizona

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and Nevada the water also produces electric
power for more than three million users

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in the southwest.

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But damage self eliminates the rushing
spring floods of the river below Hoover Dam

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The Colorado River flows
evenly throughout the year.

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Useful

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and valuable servant to the people of the
great Southwest's in addition to its

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tremendous economic importance. The
Colorado offers beauty and recreation.

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This is the Grand Canyon
of the upper Colorado.

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One of the scenic wonders of the world his
famous Canyon is another asset of the

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Colorado. One of the most beautiful

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and useful rivers of the Pacific slope.

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These rivers as we have seen.

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The Columbia in the Pacific Northwest
the Sacramento and San Joaquin

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and California.

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And the Colorado all in the southwest of
the Columbia you remember is why Deep

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River

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that carries ocean going ships navigation
on the Columbia is improved by Bonneville

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Dam

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and electric power for the Northwest
is supplied by Grand Coulee Dam in

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California both the Sacramento and San
Joaquin rivers are used for shipping.

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But remember

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that they are more valuable for irrigating
the Great Central Valley of California

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in the southwest. It is the Colorado which
has been brought to work irrigating.

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In Southern California and Arizona.

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Supplying water to Los Angeles

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and creating a like trick
power for the Southwest.

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In our four rivers of the Pacific slope.

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We have seen examples of the many ways in
which man has put rivers to work for his

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own benefit the development of the Pacific
slope is part of the story of man

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and his use of rivers
in our changing world.