urban planning

Gregoire Advisor: Tunnel “Probably Most Viable Option” To Replace Seattle’s Alaskan Way Viaduct

Washington Governor Chris Gregoire yesterday announced she’d push back by two weeks a recommendation on how to best replace the aging, earthquake-prone Alaskan Way Viaduct on State Route 99 along Seattle’s downtown waterfront. But there’s more. A top Gregoire advisor tells the Seattle Times that the deep bored tunnel proposal – energetically advanced by Viaduct Stakeholders Advisory Committee members plus our Cascadia Center and the general public – is “probably the most viable option.” Deep bore tunneling technology has advanced greatly in recent years and the method is considered highly suitable for an inland downtown tunnel away from Seattle’s waterfront. (A tunnel boring machine used for Madrid’s M30 roadway project is pictured below, right.) The Times: OLYMPIA – A proposed Read More ›