Feb. 19 morning update: Bertha approaching the pit

Posted on Feb 19 2015 10:19 AM
Since yesterday afternoon's update, Seattle Tunnel Partners has built two new concrete tunnel rings and continued mining into the southern wall of the SR 99 tunnel access pit. Bertha has travelled 14 feet since mining resumed late Tuesday evening, and work is proceeding as planned. 
 
Here's video footage (links to YouTube) of Wednesday's work. Crews from STP and manufacturer Hitachi Zosen are continuing to use caution to protect the machine from overheating or further damage as they mine through 20 feet of unreinforced concrete to reach the interior of the pit.
 
Repair plan resources:

 

Previous updates

Feb. 18, 2015 afternoon update - Bertha digs on

Feb. 18, 2015 project update - Bertha on the move

Feb. 13, 2015 project update - Safety at the forefront

Feb. 13, 2015 project update - Long-term traffic impacts on SR 99: lane closure begins March 7 through late May

Feb. 12, 2015 - Incident at tunnel's north portal work zone

Feb. 9, 2015 project update - Cradle awaits Bertha's front end

Archive of previous updates