Mystery Bay Marine State Park

Mystery Bay Marine State Park: Secluded Marrowstone Island Haven for Shellfish Harvesting and Olympic Mountain Views

Mystery Bay Marine State Park provides a secluded marine sanctuary on the western shore of Marrowstone Island in Nordland, offering 685 feet of pristine saltwater shoreline and spectacular Olympic Mountain views from its intimate 18-acre setting. This quiet cove promises boaters and shellfish enthusiasts exceptional harvesting opportunities for native littleneck clams, butter clams, Manila clams, cockles, and specially seeded oysters, all while enjoying the protected waters of Mystery Bay accessed through Kilisut Harbor with year-round moorage facilities.

Mystery Bay Marine State Park Fast Facts

Park Overview

Mystery Bay Marine State Park encompasses a secluded marine environment nestled into Marrowstone Island’s western coastline, where the small cove’s sapphire waters provide protected moorage and exceptional shellfish habitat enhanced by Washington Department of Fish and Wildlife seeding programs. The park’s intimate character centers on its role as a premier shellfish destination, featuring abundant native clams and specially enhanced oyster beds just south of the boat ramp that create one of the region’s finest harvesting experiences. Traditional territory of the Chemakum tribe, who maintained a permanent village in Port Townsend but used Mystery Bay for its abundant clamming, the area later transitioned to early 20th century farming before becoming a state park in 1972.

This marine sanctuary serves boaters seeking protected moorage and shellfish enthusiasts pursuing sustainable harvesting experiences, offering a peaceful alternative to busier Puget Sound destinations. The park’s design prioritizes marine access and resource protection, with facilities focused on supporting boat-based recreation while preserving the natural shellfish habitat that makes this location exceptional.

Activities & Recreation

Facilities & Amenities

Mystery Bay Marine State Park provides essential marine-focused facilities designed to support boat-based recreation and shellfish harvesting activities. The park features 683 feet of moorage space with seven moorage buoys operating year-round, charging fees from 1 p.m. to 8 a.m. A single-lane boat launch ramp drops gently down the beach north of the floats, accommodating various watercraft sizes. Marine support includes a pumpout station available April through October for vessels up to 55 feet with dedicated slip access. Land-based amenities include four unsheltered picnic tables available first-come, first-served, two fire rings permitted for daylight hours only, and vault-type restrooms. Drinking water is available but contains high sodium levels, with no potable water from October through March.

Camping & Accommodations

Mystery Bay Marine State Park does not offer camping facilities, focusing exclusively on day-use recreation and marine moorage services. Overnight accommodation is limited to vessels utilizing the park’s moorage facilities, which operate year-round with continuous moorage limited to three consecutive nights including dinghies. Facility use operates on a first-come, first-served basis, and leaving a dinghy at a buoy or dock does not reserve a moorage space. Dinghies must moor only in designated areas to maintain access for other users.

Planning Your Visit

Mystery Bay Marine State Park operates with seasonal hours from 6:30 a.m. to dusk (summer) and 8 a.m. to dusk (winter), with facility use available first-come, first-served throughout the year. A Discover Pass is required for day visits and parking access. The critical planning consideration involves shellfish harvesting seasons, as the park is conditionally open for clam, mussel, and oyster harvest October 1 through April 30 only, with mandatory closure May 1 through September 30. Visitors should check both Washington Department of Fish and Wildlife seasons and Department of Health daily updates before harvesting, as health classifications may change based on water quality conditions.

What to Bring & Know

• Shellfish harvesting licenses and appropriate digging equipment for accessing native littleneck clams, butter clams, Manila clams, and cockles
• Low-sodium drinking water as park water contains high sodium levels unsuitable for sodium-intolerant individuals
• Tide charts and harvest regulations, as the park’s conditional opening status requires checking both WDFW and Department of Health approvals
• Camera equipment for capturing spectacular west-facing sunset views across Mystery Bay toward the Olympic Mountains
• Marine safety equipment including life jackets, as access is primarily by boat through Kilisut Harbor channel

Final Word

Mystery Bay Marine State Park offers Marrowstone Island’s premier marine sanctuary, where protected waters and abundant shellfish create an intimate Olympic Mountain backdrop experience for discerning boaters and harvesters.

This park is part of the Explore Washington State Parks Directory—showcasing all of Washington’s State Parks from the rugged Pacific coast to the Cascade peaks. Whether you’re camping under old-growth forests, hiking scenic trails, or discovering local history, we’re highlighting the places where people connect with the state’s incredible natural and cultural heritage—all year long.