(WSDOT graphic)
No start date yet – but that two-weeks-or-so Alaskan Way Viaduct closure is in view, now that the Highway 99 tunneling machine has reached its “maintenance stop” just before going beneath the structure. The machine could stay stopped there for up to a month, says WSDOT in its announcement:
On Saturday, Bertha, the SR 99 tunneling machine, reached a planned maintenance stop near Yesler Way, after successfully mining almost 300 feet during the past three weeks. According to STP, the TBM functioned within required operating parameters. The machine has now mined a total of 1,560 feet.
Seattle Tunnel Partners will spend up to one month inspecting the machine and performing planned maintenance. Scheduled work includes:
· Performing hyperbaric interventions
· Inspecting the cutterhead, main drive unit and screw conveyor
· Replacing cutting tools
· Extending the conveyor belt and the high voltage cable.When STP has completed its maintenance work, crews will tunnel out of the maintenance stop and beneath the Alaskan Way Viaduct. WSDOT plans to close the viaduct for approximately two weeks to allow the machine to pass beneath the structure.
We will provide the public with advance notice of the closure, but the start date isn’t yet known. It will depend on the amount of work that must be completed while the machine is in the maintenance stop. STP won’t know the extent of the needed maintenance until inspections are complete, a process that could take approximately two weeks of the one-month maintenance period. Check www.99closure.org for additional details as the closure approaches.
More backstory here. Wondering how the closure will be handled? See our report (including video) on the briefing the West Seattle Transportation Coalition got last month from state and county reps; the WSTC was told WSDOT will do its best to give at least two weeks’ warning of the closure’s start.
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