Colman Dock Multimodal Terminal Redevelopment

KPFF is supporting Washington State Ferries (a division of WSDOT) in the redevelopment of the Colman Dock Downtown Seattle Ferry Terminal Renovation, the busiest ferry terminal in Washington and one of the busiest in the world. To maintain its critical role as a regional multimodal transportation hub, the team is replacing aging and seismically vulnerable wood piles and trestle foundation with steel for strength and longevity and is demolishing and replacing the ferry terminal and passenger facilities, while staying operational.

The primary vehicle loading wharf structure is being restored, while the primary Terminal Building and hydraulically controlled loading cabs are replaced with new structures. KPFF provided structural and mechanical engineering design services for the development of the Colman Dock overhead loading systems that allow foot traffic to board a top deck of ferries. This complex structure includes a 120 foot long pedestrian bridge, a cab structure supported on a 10′ diameter drilled shaft and moves vertically with the tide via a hydraulic cylinder.

KPFF managed the design and integration of the structural, mechanical and electrical systems for the large aluminum hydraulically controlled apron structure (12’ wide by 25’ long) that moves in 6 directions and allows passengers to board the vessels.

Additionally, KPFF is designing five new buildings on the site including the main terminal building, an entry building with elevated pedestrian bridges connecting them, and a new passenger only ferry assembly building onsite. KPFF worked closely with the contractor on this GC/CM project to support successful constructibility and sequencing coordination, and to reduce cost of the overall project.