Fort Flagler State Park had it's beginning as part of the Harbor Defense of Puget Sound at the turn of the 19th Century.  From 1899 until 1955, Fort Flagler joined Fort's Casey and Worden in a 'triangle of fire' defense across Admiralty Inlet, protecting Puget Sound. In 1954, the fort was deactivated and declared surplus. A year later, Washington State Department of Parks and Recreation acquired the land for use as a State Park.

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