Notice Not affiliated with the Master Mariners Benevolent Association (MMBA) or any successor organization. v.2026.05
General Overview
Facility 🚤 Full Service Marina Est. Slips ~80 Water Ocean/Bay Est. Parking ~120 spaces Lot Size Large (150+) Lot Type Surface (Striped) Confidence High

Well-organized marina with multiple docks, slips occupied by boats, and a large striped asphalt parking lot with numerous vehicles along the waterfront.

Aerial view of Affinity Marina
Pacific Coast

Affinity Marina

Seattle, WA

Affinity Marina is located on Lake Union in Seattle, Washington, an urban waterway in the Pacific Northwest that connects to Puget Sound and ultimately the Pacific Ocean, providing a sheltered setting amidst the city's skyline and surrounding hills. This marina serves recreational sailing and boating activities, catering to enthusiasts exploring the inland waters of the Puget Sound region with its mix of calm lake conditions and access to more open coastal areas.

Location Seattle, King County, Washington
Capacity ~80 slips
Coordinates 47.6478, -122.3417

Nearby Marinas in Washington

Marina Parking & Access Control

Marinas typically need to separate slip holder parking from day-visitor parking, trailer areas, launch ramps, and secure dock access points. Modern facilities use barrier gate systems to enforce these zones automatically — allowing permitted vehicles through via transponder or keycard while logging all access events.