Construction in Seattle
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Planned maintenance on SR 99

Scheduled window: Wed, Sep 30, 5:06 PM to Sat, Oct 3, 6:00 AM PT

Source says

From 10 p.m. Friday, Oct.

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2 to 6 a.m. Saturday, Oct. 3 both directions of the State Route 99 tunnel from South Hanford Street (milepost 29) to Halladay Street (milepost 34) will close for maintenance. The Royal Brougham/Colorado Avenue South on-ramp to northbound SR 99 and the Sixth Avenue North on-ramp to southbound SR 99 will also close.

Source: Road reports

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CitySignal summarizes information from third-party and public sources. Always follow instructions from the relevant government agency, utility, transit provider, or emergency authority.