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Dalco Passage is a tidal strait within Puget Sound in the U.S. state of Washington. Located between the southern end of Vashon Island and the mainland near Tacoma, Dalco Passage connects the northern main Puget Sound basin to the southern basin, via the Tacoma Narrows strait. Colvos Passage, Commencement Bay, and Quartermaster Harbor are also connected to Dalco Passage.
Map of Dalco Passage, Washington, USA
A US Coast Survey report said the name "Dalco" was given by the Wilkes expedition, 1841, however the origin of the name is unknown.
References
Dalco Passage Wikipedia(Text) CC BY-SA