Feb. 23 project update: Bertha passes the 8,000-foot mark

Posted on Feb 23 2017 3:05 PM

SR 99 tunnel crews have now bored 8,132 feet of the 9,270-foot SR 99 tunnel. The top of the machine’s cutterhead is located north of Wall Street, near Sixth Avenue North, approximately 100 feet below the surface.

Crews successfully mined past the Seattle Center Monorail late last week. From their current location, crews will continue to mine north past the intersection of Denny Way and Sixth. The machine will emerge in a pit two blocks north of Denny, at the intersection of Thomas Street and Sixth.

Progress updates are posted on Mondays and Thursdays at our Follow Bertha page. You can also follow Bertha on Twitter @BerthaDigsSR99

Balloons mark Bertha's location near Sixth Avenue North

and Wall Street on Feb. 23.

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