The sanctuary was acquired by the City of Federal Way in 1991 to prevent private residential development and preserve the critical estuarine ecosystem.
The park's wetlands serve as a natural filter for water runoff before it enters the Puget Sound, supporting juvenile salmon migration.
The site includes a remnants of a historic property that previously occupied the waterfront before it was reclaimed for public environmental use.
The sanctuary is part of a larger ecological corridor that connects various green spaces in South King County.
Dumas Bay Sanctuary is a 12-acre waterfront nature reserve located in Federal Way, Washington, centered around a protected saltwater marsh and estuary. The site features a restored habitat supporting diverse local wildlife, including migratory birds, river otters, and bald eagles. Visitors access the shoreline via a winding trail that transitions from forested uplands to the tidal beach. The property functions as both an environmental restoration zone and a public recreation area managed by the City of Federal Way. It remains one of the few undeveloped stretches of coastline in the immediate vicinity, offering direct access to the Puget Sound.
The viewing platform overlooking the salt marsh at the base of the forested slope.
Bring binoculars as the elevated viewpoints provide excellent opportunities for observing marine birds.
Wear waterproof footwear, as the trails can become muddy and the beach area is frequently damp.
Check tide charts before visiting, as the best birdwatching occurs when the tide is moving or low, exposing the mudflats.
Attempting to traverse the steep, unmaintained embankments that are prone to erosion.
Stay on marked trails to protect sensitive wetland flora and keep dogs leashed at all times.
