Mystery Bay Marine State Park

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All but hidden on the west side of Marrowstone Island, Mystery Bay State Park offers a great escape for visitors arriving by land or by water. Boaters can dock or lay anchor and stroll along the grassy and gravelly shoreline or enjoy the inlet's pristine waters.

Take along a kayak or paddleboard, shellfish harvesting buckets (and permits), or scuba gear for a day of recreation. Take in views of the Olympic Mountains from one of six unsheltered, first-come, first-served picnic tables. Cook up those oysters and clams in one of three fire rings, (fires allowed during daylight hours) and enjoy an island sunset before heading to your boat or to your campsite at nearby Fort Flagler State Park.

Park features

Boats can get to this 18-acre day-use park via the channel through Kilisut Harbor. Mystery Bay offers year-round moorage, making it a popular destination with off-season sailors and yachters.

  1. Activities
  2. Boating
  3. History
  4. Maps

Picnic & day-use facilities

The park provides six unsheltered picnic tables, all available first come, first served. Three fire rings, fires are allowed during daylight hours only. Drinking water is available. There are two vault-type restrooms, no running water, sinks or showers. Overnight camping is not allowed. Primitive campsites for boaters are available at Fort Flagler State Park.


Water activities & features

  • 683 feet of moorage
  • Boating
  • Clamming
  • Crabbing
  • Diving
  • Fishing (saltwater)
  • Oyster harvesting
  • Personal watercraft use
  • Watercraft launches

Other activities & features

  • Beach exploration
  • Bird watching
Additional information
  • Clams and oysters can be found on the beach at low tide, and crabbing is good offshore.
  • A recreational license is required for fishing and shellfish harvesting at Washington state parks. For regulations, fishing season information, or to purchase a recreational license, visit the Washington Department of Fish and Wildlife.