Fort Decatur (1)

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Fort Decatur (1855-185?) - A two-story blockhouse garrisoned by Marines from the USS Decatur during the siege of Seattle in 1856 during the Yakima Indian War. Located in present-day Seattle, King County, Washington. Also known as Seattle Blockhouse.

Fort Decatur during Battle of Seattle, painting, 26 Jan 1856 (University of Washington Archive)
Plan of Seattle 1855-1856


Built for protection from hostile Indians on the north end of the Seattle settlement during the Yakima Indian War (1855-1856). This was a two-story log blockhouse, 25 by 40 feet and 14 feet high, armed with two 9-pounder cannons from the U.S.S. Decatur. During the siege of Seattle on 26 Jan 1856, it was garrisoned by Marines from the U.S.S. Decatur who were attacked by a large number of hostile Indians. The siege was unsuccessful but the threat of a larger force of hostile Indians caused the settlers to build a second blockhouse on the south side and connect these two blockhouses with a series of breastworks and stockades. This second blockhouse was known as Fort Duwamish. No further attacks occurred.

Current Status

Marker is located in a Seattle City park. This park was populated at the time of our visit with several hundred indigents and far too dangerous to explore.

Location: Site is located at 1st Avenue and Cherry Street in Seattle, King County, Washington. Marker at 3rd Avenue and Jefferson Street, Seattle.

Maps & Images

Lat: 47.6026 Long: -122.33423

  • Multi Maps from ACME
  • Maps from Bing
  • Maps from Google
  • Elevation: .....



Fortification ID:

  • WA0128 - Fort Decatur (1)
  • WA0284 - Seattle Blockhouse

Visited: 23 Aug 2015 Area

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