A Deep-Bored Tunnel To Replace The Alaskan Way Viaduct
All over the world deep-bored vehicle tunnels are being built in major metropolitan regions. Paris. Hamburg. Zurich. Dublin. Madrid. Wuhan. Nanjing. Shanghai. Scroll down here to Cascadia Center’s chart titled “Supplemental Tunnel Project Data Examples” and you’ll see costs per mile range from $106 million to $580 million for deep-bored vehicle tunnels in these cities, typically of four to six lanes. The chart is part of a lengthier submission we made to the Alaskan Way Viaduct Stakeholders Advisory Committee (SAC). That cost range is worth noting, as SAC and state consultants work through options to replace the aging and unsafe viaduct on Seattle’s downtown waterfront. There are eight alternatives now getting a closer look, and one is a slightly curving Read More ›