Alaskan Way Viaduct Replacement Program Seattle Client The Washington State Department of Transportation Project Overview As lead designer and engineer-of-record, HNTB managed construction, testing and commissioning for the WSDOT Alaskan Way Viaduct Replacement Program. HNTB designed the permanent structures and facilities, including the tunnel liner, interior stacked roadway structure, approach cut-and-cover tunnels, approach roadways and operations buildings located at each portal. Strategy Designed to enhance safety and emergency vehicle access, the SR 99 Tunnel features a two-level roadway tunnel to replace the aging, earthquake-damaged Alaskan Way Viaduct. At 57.5 feet in diameter and nearly 2 miles long, the tunnel in downtown Seattle is the world's second-largest soft-ground, machin

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