Tamanowas Rock, Sacred ceremonial rock formation in Jefferson County, United States.
The monolithic Tamanowas Rock rises 150 feet above surrounding trees, featuring caves, crevices, and moss-covered surfaces near Anderson Lake State Park.
The site served as a refuge during the 1700 Cascadia earthquake tsunami and functioned as a strategic observation point for mastodon hunting over 10,000 years ago.
The Jamestown S'Klallam Tribe maintains this traditional gathering place, where generations of Coast Salish peoples conducted ceremonies and rituals throughout centuries.
Visitors can reach Tamanowas Rock by traveling east on Anderson Lake Road for 2.18 miles from Washington State Highway 20, then following marked trails.
The mineral composition includes Eocene subaerial adakitic lava and lava breccia, forming a distinct geological formation within Jefferson County's natural landscape.
Location: Jefferson County
GPS coordinates: 48.02208,-122.79339
Latest update: March 4, 2025 08:42
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