Dalco Passage

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Dalco Passage

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.

A US Coast Survey report said the name "Dalco" was given by the Wilkes expedition, 1841,[1] however the origin of the name is unknown.[2]


  1. ^ Meany, Edmond S. (April 1918). "Origin of Washington Geographic Names". The Washington Historical Quarterly. 9 (2): 107. 
  2. ^ "About the Washington Place Names Index". Washington Place Names. Tacoma Public Library. Retrieved 2016-04-21.  (See also the "Dalco Passage" database entry.)

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Coordinates: 47°19′18″N 122°30′41″W / 47.32167°N 122.51139°W / 47.32167; -122.51139