Seattle traffic chaos: Closures to snarl I-5, I-405, SR 99

SEATTLE - Another summer weekend will be heavily disrupted by major road construction closures. 

Road work on all three North Sound corridors through the Puget Sound region will take place from Aug. 14–17. Interstate 405 will also have closures in Tukwila and Kirkland; and I-5 and Highway 99 will have closures in Seattle.

Keep reading to see this weekend's scheduled closures, so you can plan your travel accordingly.

Primary closures around the Seattle area this weekend

Road crews are taking advantage of the dry weather to work on several projects around the Puget Sound region this weekend. Primary closures:

• Lane reductions on southbound I-405 approaching Tukwila.
• A full closure of the I-405/NE 85th Street interchange in Kirkland.
• A continued two-lane configuration on northbound I-5 across the Ship Canal Bridge.
• Northbound SR 99 closed at the 1st Ave. S. Bridge from 5.a.m. Saturday to 11:59 p.m. Sunday.
• The SR 99 tunnel will be closed in Seattle from 10 p.m. Friday to 6 a.m. Saturday.
• NE 85th St. and I-405 ramps will be closed between 6th and 124th Ave. N.E. from 10 p.m. Friday to 5 a.m. Monday

Southbound I-405 lane closures in Tukwila

Up to two lanes of south I-405 will close in Southcenter between SR 181 (Exit 1) and the I-5 interchange from 11:30 p.m. on Friday, Aug. 14 to 4 a.m. on Monday, Aug, 17. The southbound HOV ramp from I-405 to I-5 will also close.

The closure will be for crews working to pave the HOV lane as part of the I-405/Renton to Bellevue Widening and Express Toll Lanes Project.

I-405 and NE 85th Street interchange closures in Kirkland

The on- and off-ramps to both northbound and southbound I-405 in Kirland at NE 85th Street (Exit 18) will be closed from 10 p.m. on Friday, August 14 to 5 a.m. on Monday, August 17.

Northeast 85th Street will also be closed between Sixth Street to the west, and 120th Avenue Northeast to the east. Detours will be in place.

The closure will be for crews to grade pavement on Northeast 85th Street and install curbs as part of the I-405/Northeast 85th Street Interchange and Inline BRT Station Project.

SR 99 closures in Seattle

• The SR 99 tunnel will close overnight for routine tunnel maintenance from 10 p.m. on Friday, August 14, until 6 a.m. on Saturday, August 15.
• Northbound SR 99 will close at the First Avenue South Bridge for bridge and structure preservation from 5 a.m. on Saturday, August 15 until 11:59 p.m. on Sunday, August 16. East Marginal Way and Michigan Street will not be accessible from the bridge, and travelers will not be able to continue northbound on SR 99 during the closure.
• The Occidental Avenue South/South Kenyon Street connection to northbound SR 99, West Marginal Way South/South Holden Street connection to northbound SR 99, and First Avenue South connection to northbound SR 509 will also be closed.

Ship Canal Bridge in Seattle reduced to 2 lanes

The Ship Canal Bridge remains reduced to two lanes until the end of 2026 as part of the Revive I-5 project. 

The express lanes will remain open in the northbound direction only 24 hours a day. The Harvard Avenue on-ramp to northbound I-5 is still closed until mid-October.

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