Each month, Seattle Tunnel Partners submits an updated construction schedule to WSDOT. These schedules show STP’s latest projection for completing the project, in addition to listing a number of important construction activities they must complete along the way.
 
http://www.wsdot.wa.gov/Projects/Viaduct/Schedule

STP’s latest schedule, which was posted Thursday afternoon, shows that mining will resume on Dec. 23, 2015 – one month later than the date shown in the previous schedule. Accordingly, the tunnel opening date in the new schedule also has moved by one month, to April 2018. STP has told us the changes in the schedule reflect the current emphasis on giving crews the time they need to complete the tunneling machine repairs successfully.
 
Like all large construction projects, the schedule for this project changes frequently. WSDOT cannot verify any of the dates shown in this schedule.