Recorded as local legend, not as proven fact. Names, dates, and buildings are real; the haunting is the story people keep telling.
Fort Casey is the Whidbey corner of the Triangle of Fire: Casey on Whidbey, Worden at Port Townsend, Flagler on Marrowstone, the three concrete arguments the U.S. Army made about who would control the Strait of Juan de Fuca. Casey was activated in 1901. The 10-inch disappearing guns are the objects people climb on. Admiralty Head Light, a 1903 Carl Leick tower, replaced an 1861 wooden light that had to be moved for a gun battery. Mary Davis, wife of the last wooden-light keeper, Capt. C.H. Davis, died on January 21, 1901. The light was deactivated in 1922. The fort is a park. The light is a restored building the park has to keep paying for.
The folklore is a woman in a dress on the hillside, lighthouse apparitions, soldiers at the batteries. Mary Davis’s date sits next to the activation year in a way tour language finds convenient. Convenient is not the same as documented haunting. A keeper’s wife died. The wooden tower was moved for a gun. The concrete stayed. Those facts hold. The woman in a dress on the hill was added later.
Washington State Parks has run a Haunted Fort weekend to fund the light. That is a ticketed fundraiser. Dawn to dusk is the ordinary access unless you have a ticket for the other hours. A Discover Pass is the ordinary fee. A flashlight is a practical tool for the rooms under the guns, which are dark because they were built to be dark, not because anyone is waiting in them.
The tale circulated through park staff, then through the fundraiser, then through Whidbey lists that treat every battery as a sentry still on duty. Soldiers did die in the ordinary ways of a coastal fort — accident, illness, the slow grind of a posting. The Triangle never fired the war it was built for. That unused purpose is its own kind of ghost, and it does not require a uniform in the parade ground at 2 a.m.
What is unknown is whether Mary Davis is the hillside woman in any source older than the tourist era, and whether any particular enlisted death is the seed of the battery sentries. The 1901 date is solid. The dress is not.
Walk the park in posted hours. Pay for the pass. Use a light under the guns because concrete eats daylight. The strait is still the reason the guns were here. The light is still the reason the weekend exists.