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WSDOT

Damages Awarded to WSDOT for Tunnel Completion Delays
TBM Staff
October 26, 2022
Read Article
News
Jury Rules in Favor of Washington State DOT in SR 99 Case
December 16, 2019
News
SR 99 Tunnel Now Open to Traffic
February 4, 2019
News
End of the Road for Alaskan Way Viaduct
January 11, 2019
News Roadway work
SR 99 Tunnel Reaches Substantial Completion
October 31, 2018
Cover Stories Bertha breaks through near space needle
Bertha’s 9,270-ft Journey Under Seattle for SR 99

Bertha – the world’s most famous tunnel boring machine – reached her final destination amongst much fanfare on Apr...

May 31, 2017
News Bertha’s cutterhead emerges into the reception pit on April 4, 2017.
SR 99 TBM Emerges into Reception Pit

Bertha, the 57.5-ft diameter TBM building the S...

April 4, 2017
News sr-99-tunnel
SR 99 TBM Nears Breakthrough

Bertha, the TBM mining the SR 99 tunnel in Seattle, was 219 ft from its end point as of March 27, according to the Washi...

March 28, 2017
News sr 99
SR 99 TBM Gears Up for Final Stretch

Seattle Tunnel Partners has temporarily stopped mining to prepare Bertha, the SR 99 tunneling machine, for the final 1,0...

March 3, 2017
Ventilation Figure 2
Ventilation and Safety Systems Design for SR99 Single Bore Tunnel

Innovative design of Seattle’s SR 99 tunnel facilities - including ventilation - required close coordination of static...

February 22, 2017
News
SR 99 TBM Passes Halfway Mark

The SR 99 TBM Bertha passed a significant milestone in its journey underneath Seattle. When the machine tunneled past Pi...

October 3, 2016
News
SR 99 Tunnel Passes 4,000-ft Mark

Seattle Tunnel Partners crews have now mined more than 4,000 ft as they continue their push toward the SR 99 tunnel’s...

August 29, 2016
News sr-99
SR 99 TBM Reaches Half-Mile Mark

Seattle Tunnel Partners has now bored more than one-half mile of the SR 99 tunnel. As of June 13, Bertha, the SR 99 tunn...

June 15, 2016
News SR 99 TBM
Seattle Tunnel Partners Set to Repair Damaged Pier

Seattle Tunnel Partners is set to repair damage that occurred at the Port of Seattle's Terminal 46 during the Jan. 12 ba...

February 8, 2016
News
WSDOT Suspends SR 99 Tunneling Following Sinkhole

The Washington State Department of Transportation (WSDOT) has notified Seattle Tunnel Partners, the deign-build contract...

January 15, 2016
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