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 ~30 spaces Lot Size Small (<50) Lot Type Surface Confidence High

Medium-sized marina with numerous slips occupied by boats, several buildings, and a small adjacent surface parking lot with few vehicles.

Aerial view of Sea Scout Base Lake Union
Pacific Coast

Sea Scout Base Lake Union

Seattle, WA

Sea Scout Base Lake Union is a marina located on the shores of Lake Union, a freshwater lake in the heart of Seattle, Washington, which is nestled in the Pacific Northwest region and connected via the Lake Washington Ship Canal to Puget Sound and the broader Pacific Coast. This facility serves as a hub for Sea Scout programs, which focus on youth-oriented sailing and boating activities in the protected inland waters of Lake Union. These waters provide opportunities for learning maritime skills in a scenic urban setting surrounded by Seattle's skyline and nearby islands.

Location Seattle, King County, Washington
Capacity ~80 slips
Coordinates 47.6486, -122.3312

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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.