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The Rest of the Bertha’s Journey Route Fifty

2021-4-30  SEATTLE — It wasn’t supposed to take this long, but “Bertha,” which launched as the world’s largest tunnel-boring machine in July 2013, finally emerged on April 4 in a concrete pit a few blocks from the Space Needle after its two-mile journey

Alaskan Way Viaduct Tunneling

The tunneling machine known as Bertha began tunneling beneath Seattle in July 2013 (photo at right: the machine's cutterhead being lowered into the launch pit near Seattle's stadiums). The machine completed its tunneling on April 4, 2017 and was fully dismantled and removed from the tunnel on Aug. 23, 2017. + Bertha's tunnel route

Hard grind: The epic journey of the world's biggest tunnel

2017-5-1  Bertha's journey started not in Seattle, but in Nisqually, Washington, about 60 mi (100 km) south of Seattle. On February 28, 2001 at 10:54 am, the rural community was the epicenter of

Big Bertha's Two-Mile Subterranean Journey Is Almost Over

2017-1-25  When the State Route 99 tunnel opens under Seattle, the Alaska Way Viaduct over it will be demolished. Just like Bertha, the slow progress of American

World's largest tunneling machine digs in New Atlas

2013-8-2  Bertha, the world’s largest tunnel boring machine (TBM), started digging under Seattle on Tuesday as it chewed through the north wall of the 80-ft (24.3 m) deep trench where it was assembled

Bertha is officially completely dismantled Curbed Seattle

2017-8-24  — Bertha (@BerthaDigsSR99) August 23, 2017 It’s the end of an era: Bertha, the much-maligned tunnel-boring machine that drilled the State Route 99 Viaduct replacement tunnel, has officially...

Trial begins in case of Bertha breakdown and Seattle's SR

2019-10-11  OLYMPIA, Wash — The trial to determine who is to blame for the construction delays of Seattle's State Route 99 tunnel and cost overruns started

Tunnel timeline: From conception to tunnel completion to

2019-12-13  Seattle tunnel critic files lawsuit to stop repairs on Bertha. WSDOT, STP announce tunneling will not resume until March 2015. Related: With Bertha at a

Seattle State Route 99 tunnel: A quick guide Curbed Seattle

2019-1-31  13 routes heading northbound to downtown that used to take the viaduct start in the same bus lane on northbound 99, then take the northbound exit before the tunnel

Get a 360-Degree Tour of Seattle's Gargantuan Tunneling

2017-3-14  The new State Route 99 tunnel that Bertha is boring will be a major boon to the city, allowing two tiers of traffic to flow where before the only option was the aging, congested Alaska Way Viaduct.

Tunnel boring machine named Bertha begins digging new

2015-1-2  On July 30, 2013, Seattle Tunnel Partners begins digging a new State Route 99 tunnel underneath downtown Seattle using a tunnel-boring machine named Bertha. The machine is to dig a 57.5-foot-diameter tunnel -- the largest in the world at the time work starts, and designed to carry a double-decker highway with two lanes in each direction -- from

Big Bertha's Two-Mile Subterranean Journey Is Almost Over

2017-1-25  More than 150 feet below the streets of Seattle, Bertha presses on, boring a 57.5-foot diameter tunnel underneath the city. The largest tunnel boring machine (TBM) in the world when it

Inside the Massive Tunnel Seattle Built to Replace an

2017-10-23  Bertha finally broke through in April of this year, having dug nearly 1.7 miles of tunnel. Now, Seattle's builders are kitting out the empty concrete tunnel it left behind with stacked roadways

Bertha is officially completely dismantled Curbed Seattle

2017-8-24  It’s the end of an era: Bertha, the much-maligned tunnel-boring machine that drilled the State Route 99 Viaduct replacement tunnel, has officially completely come apart. Seattle Tunnel Partners

New photos: With viaduct in rear view, Bertha begins

2016-6-5  A view south of the SR 99 tunnel from the back end of Bertha in May. Here the tunnel takes a slight westward turn as it heads under downtown Seattle near Yesler Way.

Trial begins in case of Bertha breakdown and Seattle's SR

2019-10-11  Trial begins in case of Bertha breakdown and Seattle's SR 99 tunnel construction delays A Thurston County jury is hearing arguments in the case that could put

Seattle Tunnel Partners ENR

The holiday season provided some rest for Bertha, the tunnel-boring machine roughly three-quarters of the way through its route to bore a new State Route 99 tunnel under downtown Seattle, but that

Watch: Flying tour of Seattle tunnel

2017-10-20  Bertha has moved on to whatever afterlife is reserved for massive mechanical marvels. But work on the state Route 99 tunnel to replace the Alaskan Way Viaduct is still underway, with workers

Seattle State Route 99 tunnel: A quick guide Curbed Seattle

2019-1-31  The State Route 99 tunnel opened the better part of a year ago, and now we’re about to hit another milestone: After several months of free passage, the long-promised tolling is going to start on

Tunnel boring machine named Bertha begins digging new

2015-1-2  On July 30, 2013, Seattle Tunnel Partners begins digging a new State Route 99 tunnel underneath downtown Seattle using a tunnel-boring machine named Bertha. The machine is to dig a 57.5-foot-diameter tunnel -- the largest in the world at the time work starts, and designed to carry a double-decker highway with two lanes in each direction -- from

Inside the Massive Tunnel Seattle Built to Replace an

2017-10-23  Bertha finally broke through in April of this year, having dug nearly 1.7 miles of tunnel. Now, Seattle's builders are kitting out the empty concrete tunnel it left behind with stacked roadways

Big Bertha's Two-Mile Subterranean Journey Is Almost Over

2017-1-25  More than 150 feet below the streets of Seattle, Bertha presses on, boring a 57.5-foot diameter tunnel underneath the city. The largest tunnel boring machine (TBM) in the world when it

Seattle Tunnel Partners ENR

The holiday season provided some rest for Bertha, the tunnel-boring machine roughly three-quarters of the way through its route to bore a new State Route 99 tunnel under downtown Seattle, but that

Bertha is officially completely dismantled Curbed Seattle

2017-8-24  It’s the end of an era: Bertha, the much-maligned tunnel-boring machine that drilled the State Route 99 Viaduct replacement tunnel, has officially completely come apart. Seattle Tunnel Partners

Watch: Flying tour of Seattle tunnel

2017-10-20  Bertha has moved on to whatever afterlife is reserved for massive mechanical marvels. But work on the state Route 99 tunnel to replace the Alaskan Way Viaduct is still underway, with workers

SR 99 Tunnel, USA Mott MacDonald

2019-10-22  The 7000t, US$80M tunnel boring machine (TBM), named Bertha, had a 17.5m diameter cutting head. Operated by 25 workers, piloting it was like driving a five-storey building under Seattle. The original tunnel alignment followed the shortest possible distance, but routed Bertha through very soft soil beneath Seattle’s historic district.

Seattle tunnel machine finishing troubled journey The

2017-4-4  Bertha, the machine digging a 1.75 mile tunnel under Seattle to replace a waterfront bridge with an underground roadway, is reaching the end of its journey. (AP Photo/Elaine Thompson) Water begins to pour from the base as a massive tunneling machine nears breaking through a five-foot wide concrete wall into the disassembly pit for the State

Bertha breaks through: SR 99 tunneling machine emerges

2017-4-4  Today, with the viaduct and more than 9,270 feet of new tunnel safely behind them, there was nothing left to face but daylight as the SR 99 tunneling machine chewed its way into a pit near Seattle Center. Bertha’s 1.7-mile drive beneath Seattle came to a successful end Tuesday afternoon, April 4, 64 years to the day since the viaduct first

Seattle State Route 99 tunnel: A quick guide Curbed Seattle

2019-1-31  The State Route 99 tunnel opened the better part of a year ago, and now we’re about to hit another milestone: After several months of free passage, the long-promised tolling is going to start on