John Hennessy III,
P.E.
For more than eight decades the Meridian Street Bridge over the Puyallup River has served as a portal for cities along the Puget Sound to community of Puyallup, Washington. Significant for its design, it is the only one of its kind in Washington, and may very well be unique in the United States, if not the world.
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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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At 3:50 a.m. on April 11, 2016, WSDOT Incident Response Team drivers completed the maiden voyage across the new SR 520 floating bridge. The westbound lanes on the new bridge are now open to all drivers. Eastbound lanes will switch to the new bridge during the weekend of April 22-25.
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THE EVERGREEN STATE COLLEGE
CENTER FOR SUSTAINABLE INFRASTRUCTURE
Rewiring the Northwest’s Energy Infrastructure paints a picture of an integrated energy system in Oregon and Washington that, by 2040, is among the most sustainable and resilient in the world. At the same time, that 2040 energy system will be beneficial and affordable to the people that will pay for it: rich, middle-class, and lower-income people alike, as well as institutions, communities, and businesses big and small.
Planner and biking advocate Veronica Davis discusses her decision to give up her personal car, and the future of urban transportation options.
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By the summer of 2010 in Manette, Washington, the people of this quiet community by the water had learned that soon they would have to say goodbye to an old friend–a friend that had been with them for 80 years and had served their community year-in and year-out; a strong, faithful companion who, now ravaged by time and the elements, would be unable to continue. That friend was simply known as the Manette Bridge.
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AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)
NATIONAL CAPITAL SECTION
The District of Columbia has 265 bridge structures; 226 of the bridges are owned by the D.C. Department of Transportation (DDOT) and the remaining 39 are owned by the National Park Service (NPS). The average age of a bridge in D.C. is 58 years, and 80% of the bridges will need to be replaced or rehabilitated in the next 10 years. However, the District made significant strides to reduce the number of structurally deficient bridges from 8% to 3% in just three years. Despite this progress, more than 220,000 trips are taken over a structurally deficient bridge every day and a quarter of bridges have at least one major component in fair condition.
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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