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Puget Sound is the Second largest inland estuary in North America.
This inland waterway connects with the Pacific Ocean at it's north
end and extends more than 100 miles south to Olympia Washington.

The tides and currents of Puget Sound are affected by variations in
depth and width; and islands that populate the Sound.

Narrow points in the Sound like Deception Pass and the Tacoma
Narrows restrict the tidal action and cause fast moving currents.

The topology of the Sound also effects how tides effect local areas.
Mud flats in the south Sound have long gradual slopes. Tide changes
expose large areas of gently sloping mud flats. Deep Harbors like
Elliott Bay in Seattle, can have 12 foot plus tide changes and still
allow ships to float at anchorage.

As with all bodies of water, the tides vary through-out the month
and the year due to the gravitational pull of the Sun and Moon and
other gravitational influiences.

Movie: Puget Sound Tides

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Copyright Pacific Science Center 2000
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Updated 24, May 2000