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The average volume of water flowing in and out of Puget Sound during each tide is 1.26 cubic miles (5.3 km 3). The maximum tidal currents, in the range of 9 to 10 knots, occurs at Deception Pass. [3] Water flow through Deception Pass is approximately equal to 2% of the total tidal exchange between Puget Sound and the Strait of Juan de Fuca. [3]
The tidal currents have velocities up to six knots; the flood tide sets southwesterly, and the ebb tide northeasterly. The traditional winter village of the Suquamish people was located on Agate Pass. It was the site of Old Man House, the largest longhouse on Puget Sound, and is the location of Haleets, a petroglyph.
The Colvos Passage is a tidal strait within Puget Sound in the American state of Washington running west of Vashon Island between the island and the Kitsap Peninsula. It lies just north of the Dalco Passage. Colvos Passage has a permanent predominantly northbound current, in contrast to the rest of Puget Sound which varies with the tide.
Deception Pass is a dramatic seascape where the tidal flow and whirlpools beneath the twin bridges connecting Fidalgo Island to Whidbey Island move quickly. During ebb and flood tide current speed reaches about 8 knots (9.2 mph), flowing in opposite directions between ebb and flood. [9]
Though only 6 kilometres (3.7 mi) wide at the narrowest point (between the Point Wilson and Admiralty Head lighthouses), it is through this passage that nearly all the seawater flows into and from Puget Sound during daily tidal variations. Tidal currents can reach six knots in the area northeast of Point Wilson.
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As tides change in the South Puget Sound, Hammersley Inlet is the only artery through which all water must flow between the Oakland Bay and the greater Puget Sound. As tides change, they force the water through narrow, winding, shallow, Hammersley, producing erratic currents up to 5 knots (9 km/h).
When the tide comes in or rises, water flows into the lagoon. At low tide, the lagoon drains back into the Sound. Monday’s high tide at the Tacoma Narrows occurred at 9:13 p.m., according to NOAA.