On the second full day of the two-weeks-or-so Alaskan Way Viaduct closure, a “precaution” until the Highway 99 tunneling machine finishes going beneath the AWV, here’s the brief update WSDOT just published:
After completing the first ring, STP crews have been preparing the machine to move out of the concrete of the maintenance stop. The transition from concrete into soil is an important part of tunneling under the viaduct and STP crews have been working to ensure that the transition goes smoothly. Once the machine is fully prepared to mine through this transition, crews will advance slowly and deliberately.
So as of this update, no additional distance has been added to the first-day 6.5-foot tally. Next update is expected about this time tomorrow; still almost 380 feet left to go to get all the way beneath The Viaduct.
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