SEATTLE - The first round of inspections for the State Route 99 tunnel since the Alaska Way Viaduct demolition is about to get underway. While crews work on their tests, some closures will be in effect this October.

While the tests will last two weeks, the inspection crews will only need to shut the tunnel down over the course of two weekends. Drivers will need to take detours during these days.

What's next:

WSDOT will begin reducing lanes at 9 p.m. on Friday, Oct. 4. Full closure will be in effect from 10 p.m. that night until 6 a.m. on Saturday, Oct. 5.

There will be another closure from 10 p.m. on Friday, Oct. 11 until Sunday, Oct. 13 at 6 a.m.

State Route 99 tunnel entrance under Seattle (FOX 13 Seattle)

Southbound traffic will detour to the Harrison Street off-ramp and no

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