Both directions of the State Route 99 tunnel in Seattle will close from 10 p.m. Friday, June 6, to 6 a.m. Saturday, June 7, for maintenance.

Washington State Department of Transportation maintenance crews will start closing northbound and southbound lanes at 8:30 p.m. with the tunnel fully closed by 10 p.m. Drivers going south on SR 99 will need to take the Harrison Street off-ramp, and northbound SR 99 drivers will need exit at Alaskan Way. The Sixth Avenue and Royal Brougham Way on-ramps also will close at 9 p.m.

Crews will perform several important tasks during the closure, including:

– Fire suppression testing

– Cleaning and marking drains

– Fixing lights

People traveling through downtown Seattle Friday night should use alternate routes. For up-to-date traffic information use the

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