John Hennessy III,
P.E.
With a time-lapse camera mounted 54-feet high, you almost get a bird’s-eye view of work inside Seattle’s SR 99 tunnel. As the tunneling machine Bertha builds the tunnel, road crews are right behind – building the foundations, walls and the top deck of the double-deck highway drivers will travel on when the tunnel opens. Take a look.
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Written by David Parker Brown, Editor-in-Chief and Founder of Airline Reporter The Seattle-Tacoma International Airport (SEA) has been my home airport most of my life. I have seen the many changes over the years and I am proud to call it mine. Growing up, I lived in Oak Harbor, WA (about 90min northwest of Seattle) […]
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TRANSPORTATION SUSTAINABILITY RESEARCH CENTER Impacts of Car2Go on Vehicle Ownership, Modal Shift, Vehicle Miles Traveled, and Greenhouse Gas Emissions: An Analysis of Five North American Cities Executive Summary Carsharing is the shared use of a vehicle fleet by members for tripmaking on a per trip basis. There are four forms of carsharing in North America today: […]
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This video was provided by Ballard Marine Construction, the firm in charge of managing and performing hyperbaric work on the SR 99 Tunnel Project in Seattle. It shows crews at work behind the SR 99 tunneling machine’s cutterhead during a planned maintenance stop in spring 2016. To stabilize soil and water that would otherwise flow through openings in the cutterhead, crews must pump compressed air into their work space at the front end of the machine.
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After nearly a week of tunneling under the Alaskan Way Viaduct, crews are steadily continuing Bertha’s underground drive towards downtown Seattle. This video gives you a behind-the-scenes glimpse into how the new tunnel is being built, showcasing the complex operations involved in this project. Massive concrete ring segments are transported to Bertha’s segment erector where they are lifted into place, allowing the machine to push forward while the excavated soil is transported along a network of conveyer belts and into a barge moored at Elliott Bay’s Pier 46.
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Approximately 20 percent of the SR 99 tunnel was designed to be built without Bertha, the SR 99 tunneling machine. Seattle Tunnel Partners bored more than 1,000 feet of tunnel before they stopped to repair Bertha. Since then, they have built an additional 1,200 feet of tunnel using cut-and-cover tunnel construction. This video gives a close-up look inside the newest part of the project to learn more about the tunnel built without Bertha.
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Animation – The basics on riding Link light rail to and from the airport including finding the station, buying a ticket, ORCA cards and more.
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After an earthquake revealed its instability in 2008, the state of Washington announced it was going to tear down a crumbling double-decker stretch of freeway known as the Alaskan Way Viaduct. After a heated debate, the state decided to use a giant drill named “Bertha” to deep-bore underground tunnel to replace it. Seven years later, the Viaduct is still up, Bertha is stuck underground, and the city’s residents have been left to wonder whether this major project will ever be worth the time and money spent on it.
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Thank you to Governor Inslee and the Washington State Legislature for passing this monumental transportation package
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