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(upbeat music)

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- [Narrator] Keeping fish
cool during hot summertime

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temperatures requires
engineering, expertise,

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and dedication.

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The type of expertise and
dedication that the men

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and women of the U.S.
Army Corps of Engineers

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Walla Walla district, display every day.

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According to the National Oceanic

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and Atmospheric Administration, NOAA,

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2015, 2016, and 2017 were
the hottest years on record.

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And warm water temperatures
above 68 degrees

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aren't good for salmon and
steelhead in the Columbia

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and Snake River system.

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So when summer temperatures
spiked the Walla Walla district

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scientists, biologists,
and engineers responded

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by developing fish cooling
systems at Lower Granite Dam

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and Little Goose Dam on the Snake River.

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The four lower Snake River Dams
are multiple use facilities

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that provide navigation,
hydropower, recreation,

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and fish and wildlife
conservation benefits.

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When the dams were
constructed the Corps built

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adult fish ladders to allow
adult salmon, and steelhead,

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to swim through the dams
as they return to their

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natural spawning areas.

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The Corps' engineers
developed a system that cools

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the Snake River by
augmenting it with flows

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from Dworshak dam and by
incorporating cooling upgrades

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within the Lower Granite and
Little Goose dams fish ladders.

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The following image
depicts the south shore of

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the Lower Granite Dam during construction.

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As you can see, the fish
ladder exit and make-up water

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are located near normal
surface water elevation.

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Also note the unique feature
of the fish ladder pumps

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and their associated intake.

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These pumps were originally
designed for emergency

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operations during flood conditions,

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allowing adult fish passage
to continue when the

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forebay was intended to
be drawn down 18 feet

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to prevent flooding at Lewiston, Idaho.

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To reduce make-up water
temperatures a large chimney

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with an open top and bottom
was designated to encapsulate

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its intake and draw
cooler water from 60 feet

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beneath the water's surface.

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To improve conditions for the ladder exit

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and the nearby forebay environment,

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a large spray bar was
developed which incorporated

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the use of the emergency
fish ladder pumps.

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The pumps were reoriented and
plumbed into the spray bar

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and the original intake
structure was also extended

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to a depth of 60 feet,
like the make-up water.

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The spray, which is centered
directly over the ladder exit,

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accounts for twice as much
flow as what is entering

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the exit during normal forebay operation.

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The surplus cooler water
is then allowed to mix

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within the immediate
forebay area with the intent

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to create a gradual transition
for salmon and steelhead

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entering the forebay environment.

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The Corps is committed to
recovery and improving technology

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like the water cooling
systems at Little Goose

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and Lower Granite locks and dams.

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It is one of the many ways the
U.S. Army Corps of Engineers

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is pioneering some of the
most advanced fish recovery

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technology regarding
environmental stewardship.