deep-bored tunnel

Earlier this month, Washington Gov. Chris Gregoire, Seattle Mayor Greg Nickels and King County Executive Ron Sims announced an historic accord to replace the seismically vulnerable Alaskan Way Viaduct on SR 99 along the downtown Seattle waterfront with an inland deep bored tunnel. (The last page of this state summary provides details on all project components and planned funding – the tunnel is expected to cost between $1.2 and $2.2 billion). State legislative approval is required. Now, Washington State Senate Majority Caucus Chair Ed Murray, State Senate Transportation Committee Chair Mary Margaret Haugen (pictured, right), the committee’s Ranking Minority Member Dan Swecker, and committee member Fred Jarrett of Mercer Island have introduced Senate Bill 5768 to get the tunnel built. Read More ›

In an interview with Ross Reynolds on KUOW-FM – MP3 audio file here – Washington Governor Chris Gregoire said it was “very likely” that tolling would be applied to the new deep bored tunnel planned to replace the seismically vulnerable Alaskan Way Viaduct on State Route 99 in Seattle. (A state rendering of the bored tunnel’s cross-section is below, right.) At the 3:02 mark, she states: It’s very likely that we will toll. Any mega-project that we do today is having to be tolled because historically we had so much federal money coming in (but) we no longer do… Reflecting a viewpoint similar to Gregoire’s, State Senator Ed Murray told the Seattle Times about the tunnel funding mix: “There has Read More ›

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 ›