Seattle Tunnel Partners

Seattle Tunnel Partners is a construction company responsible for building the underground deep-bore tunnel beneath downtown Seattle. This tunnel replaces the aging Alaskan Way Viaduct, a crucial highway along the waterfront. The project involves advanced engineering, including digging through challenging geology, and managing complex logistics to minimize disruptions. Seattle Tunnel Partners oversees the entire process—from designing and excavation to safety and quality control—ensuring the tunnel functions as a modern transportation route that improves city traffic flow and safety.