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seattle tunnel project earthquakes

Seattle’s SR 99 tunnel designed to withstand major earthquakes

Dec 13, 2018 SEATTLE — Seattle's new State Route 99 tunnel is designed to hold up against most major earthquake threats the Pacific Northwest faces including "The Big One." The new Highway 99 tunnel

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SR 99 tunnel WSDOT

In February 2001, a 6.8 magnitude earthquake struck near Seattle, causing several foundations of the Alaskan Way Viaduct to shift as much as five inches. Engineers believe the viaduct would have collapsed had the earthquake lasted a few moments longer.

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Alaskan Way Viaduct Replacement Program WSDOT

Program overview The Alaskan Way Viaduct, an elevated section of State Route 99 in Seattle, was built in the 1950s, and decades of daily wear and tear took a toll on the structure. The structure was weaked in the 2001 Nisqually earthquake, requiring emergency repairs. Because of the viaduct’s age and vulnerability to earthquakes, replacing it was critical to public safety.

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Seattle Opens Longest Road Tunnel in the U.S. Cities

Feb 04, 2019 The $3.3 billion, 2-mile-long tunnel will replace the earthquake-damaged Alaskan Way Viaduct, which the city plans to tear down this month to make

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Shaking and Quaking in the 2001 Earthquake Port of Seattle

Feb 25, 2021 Service tunnel renewal project The service tunnel and central loading dock underneath the arrivals area were strengthened to withstand the magnitude of an earthquake with the probability of occurrence once every 475 years. In other words, a large seismic event.

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Project of the Year: Washington State Dept. of

Dec 12, 2019 “The SR 99 tunnel is designed to withstand a strong earthquake—unlike the seismically vulnerable viaduct that previously carried SR 99 through downtown Seattle.

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Seattle's unbelievable transportation megaproject

Jun 05, 2015 Seattle’s unbelievable transportation megaproject fustercluck Seattle is involved in a slow-motion catastrophe, as construction of a new car-centric tunnel grinds to a

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Seattle’s SR 99 tunnel designed to withstand major earthquakes

Dec 12, 2018 Officials say Seattle’s new State Route 99 tunnel isn’t earthquake-proof, but it’s state-of-the-art in terms of the types of quakes it’s designed to withstand.

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Seattle’s SR 99 tunnel designed to withstand major earthquakes

The new Highway 99 tunnel running under downtown Seattle is designed to last a century. Over the next 100 years, there is little question it will have to withstand at least two earthquakes, like

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Shaking and Quaking in the 2001 Earthquake Port of Seattle

Here are a few highlights of recent projects: Service tunnel renewal project. The service tunnel and central loading dock underneath the arrivals area were strengthened to withstand the magnitude of an earthquake with the probability of occurrence once every 475

More

Seattle Opens Longest Road Tunnel in the U.S. Cities

Feb 04, 2019 The $3.3 billion, 2-mile-long tunnel will replace the earthquake-damaged Alaskan Way Viaduct, which the city plans to tear down this month to make

More

A look back at the West Seattle Bridge process; Is a

Jan 18, 2021 King County it should be noted regularly dredges the lower Duwamish at a rate of hundreds of thousands of cubic yards a year, and Vigor shipyards is embarking on a brand new salmon estuary at the mouth of the Duwamish some 400 yards from a potential tunnel dredge project. Sound Transit is planning to bring light rail to West Seattle

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Alaskan Way Viaduct Wikipedia

The Alaskan Way Viaduct ("the viaduct" for short) was an elevated freeway in Seattle, Washington, United States, that carried a section of State Route 99 (SR 99). The double-decked freeway ran north–south along the city's waterfront for 2.2 miles (3.5 km), east of Alaskan Way and Elliott Bay, and traveled between the West Seattle Freeway in SoDo and the Battery Street Tunnel in Belltown.

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Alaskan Way Viaduct Replacement Transforming Seattle

Mar 20, 2021 Removal of viaduct is opening up downtown waterfront to the public. The Seattle underground scene has a new star: The Alaskan Way Tunnel, a nearly two-mile-long, double-decked road tunnel that is improving travel through the city’s downtown and paving the way for a revitalized public waterfront.. The tunnel, which carries traffic along Washington State Route 99, replaced the

More

Seattle's big tunnel project reaches a milestone, but it's

May 01, 2017 A project to bore a tunnel under Seattle and construct an underground roadway is $60 million over budget, not $400 million as reported; the contractor is seeking more than

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The Alaskan Way Viaduct: How Seattle chose the Bertha

May 23, 2017 In April of 2017, Bertha, the massive tunnel-boring machine successfully completed digging a nearly 2 mile deep-bore tunnel under Seattle. The tunnel will ca...

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Here’s Why Seattle’s New SR 99 Tunnel Has No Downtown

“The tunnel is very, very deep in the middle, and adding downtown exits was just impractical with the alignment of the tunnel,” says Brian Russell, SR 99 project manager for HNTB Corp., which is the lead designer on the tunnel project and part of a design-build team that also includes Dragados USA and Tutor Perini Corp.

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Seattle Tunnel Gets Nat’l Award

The $3.3 billion project, installed a two-mile long tunnel, designed to withstand a 9.0 magnitude earthquake. Meanwhile, the Georgia Department of Transportation's Columbus Riverwalk project, which is providing residents with a safe place for biking, jogging and walking, received the highest number of online votes in the competition, earning it the People's Choice award.

More

Seattle’s SR 99 tunnel designed to withstand major earthquakes

Dec 13, 2018 Officials say Seattle’s new State Route 99 tunnel isn’t earthquake-proof, but it’s state-of-the-art in terms of the types of quakes it’s designed to withstand.

More

Project of the Year: Washington State Dept. of

Dec 12, 2019 “The SR 99 tunnel is designed to withstand a strong earthquake—unlike the seismically vulnerable viaduct that previously carried SR 99 through downtown Seattle.

More

Seattle Opens Longest Road Tunnel in the U.S. Cities

Feb 04, 2019 Seattle's Highway 99 tunnel, the longest road tunnel in the contiguous U.S., opened Monday, offering the public easy access from the city's downtown to its waterfront attractions.

More

Seattle's unbelievable transportation megaproject

Jun 05, 2015 Seattle’s unbelievable transportation megaproject fustercluck Seattle is involved in a slow-motion catastrophe, as construction of a new car-centric tunnel grinds to a

More

Are tunnels actually dangerous during an earthquake? Red

In addition, a tunnel could suffer varying amounts of damage if the earthquake is extreme, or if the tunnel intersects or is near a fault line. Engineers, however, are able to design tunnels to withstand pretty severe earthquakes. The tunnel Seattle is building, for example, is strong enough to withstand a

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A look back at the West Seattle Bridge process; Is a

Jan 18, 2021 King County it should be noted regularly dredges the lower Duwamish at a rate of hundreds of thousands of cubic yards a year, and Vigor shipyards is embarking on a brand new salmon estuary at the mouth of the Duwamish some 400 yards from a potential tunnel dredge project. Sound Transit is planning to bring light rail to West Seattle

More

Alaskan Way Viaduct Wikipedia

The Alaskan Way Viaduct ("the viaduct" for short) was an elevated freeway in Seattle, Washington, United States, that carried a section of State Route 99 (SR 99). The double-decked freeway ran north–south along the city's waterfront for 2.2 miles (3.5 km), east of Alaskan Way and Elliott Bay, and traveled between the West Seattle Freeway in SoDo and the Battery Street Tunnel in Belltown.

More

Alaskan Way Viaduct Replacement Transforming Seattle

May 01, 2020 Removal of viaduct is opening up downtown waterfront to the public. The Seattle underground scene has a new star: The Alaskan Way Tunnel, a nearly two-mile-long, double-decked road tunnel that is improving travel through the city’s downtown and paving the way for a revitalized public waterfront.. The tunnel, which carries traffic along Washington State Route 99, replaced the

More

Seattle's big tunnel project reaches a milestone, but it's

May 01, 2017 A project to bore a tunnel under Seattle and construct an underground roadway is $60 million over budget, not $400 million as reported; the contractor is seeking more than

More

Here’s Why Seattle’s New SR 99 Tunnel Has No Downtown

“The tunnel is very, very deep in the middle, and adding downtown exits was just impractical with the alignment of the tunnel,” says Brian Russell, SR 99 project manager for HNTB Corp., which is the lead designer on the tunnel project and part of a design-build team that also includes Dragados USA and Tutor Perini Corp.

More

Seattle's Alaskan Way Viaduct coming down 30 years after

Jan 08, 2019 Also see Seattle’s SR 99 tunnel designed to withstand major earthquakes “The DOT did an in-house review of the viaduct, and the structure looks a lot like the Cyprus structure.

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Seattle Tunnel Gets Nat’l Award

Nov 09, 2020 The $3.3 billion project, installed a two-mile long tunnel, designed to withstand a 9.0 magnitude earthquake. Meanwhile, the Georgia Department of Transportation's Columbus Riverwalk project, which is providing residents with a safe place for biking, jogging and walking, received the highest number of online votes in the competition, earning it the People's Choice award.

More

The Alaskan Way Viaduct: How Seattle chose the Bertha

In April of 2017, Bertha, the massive tunnel-boring machine successfully completed digging a nearly 2 mile deep-bore tunnel under Seattle. The tunnel will ca...

More

Seattle’s SR 99 tunnel designed to withstand major earthquakes

Dec 13, 2018 Officials say Seattle’s new State Route 99 tunnel isn’t earthquake-proof, but it’s state-of-the-art in terms of the types of quakes it’s designed to withstand.

More