 April 15, 2026
The first full closure of State Route 9 for the SR 9 Marsh Road to Second Street Widening and Bridge Painting project will take place from 9 p.m. Friday April 17, through 5 a.m. Monday April 20, 2026.
During this closure construction crews working for Washington State Separtment of Transportation will set up a work zone on the west side of SR 9. Once set up, this work zone will allow us to begin the widening work on SR 9 to expand the existing two-lane configuration to four lanes between Marsh Road and Second Avenue, while disrupting traffic as little as possible.
Another planned full closure will happen when we shift traffic onto the new bridge over the Snohomish River, to begin repairing and repainting the existing steel truss bridge.
This closure will be later in the project, once the new bridge is completed.
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 People traveling in Lynnwood and Alderwood should plan for overnight closures of three freeway ramps at the Interstate 5, I-405 and SR 525 interchange. Contractor crews working for the Washington State Department of Transportation will be grinding and repairing pavement on the southbound I-5 ramp to southbound I-405, and the northbound I-405 ramps to southbound I-5 and northbound SR 525.
This work depends on warmer, dry weather and may be rescheduled if there is rain in the forecast.
What to expect
Overnight closures of the southbound I-5 ramp to southbound I-405:
- 10 p.m. Sunday April 19, to 4 a.m. Monday, April 20.
- 9 p.m. Tuesday April 21, to 2 a.m. Wednesday, April 22.
- 9 p.m. Wednesday April 22, to 4 a.m. Thursday, April 23.
Overnight closures of the northbound I-405 ramps to southbound I-5:
- 9 p.m. Monday, April 20 to 5 a.m. Tuesday, April 21.
- 2 a.m. to 5 a.m. Wednesday, April 22.
- 10 p.m. Thursday, April 23 to 5 a.m. Friday, April 24.
Drivers should expect delays and follow signed detours or use alternate routes.
This work is part of the SR 525/I-405 Interchange to SR 99 Vicinity - Paving & ADA project that will pave roughly two miles in both directions of SR 525 from the I-405 interchange to just south of 148th Street Southwest, as well as eight ramps in the area.
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Mukilteo
From 5 a.m. to noon Saturday, April 18, expect a lane shift on SR 525 at Harbor Point Boulevard in Mukilteo for sign removal. The two right lanes of northbound SR 525 will shift into the southbound lanes for this closure. Expect delays, especially near the Mukilteo ferry terminal.
Everett
From 9 a.m. to 2:30 p.m. on Monday, April 20, one right lane of northbound SR 529 over the Snohomish River bridge will close for maintenance. Crews will perform routine inspection checks.
Della Kostelnik Juarez, WSDOT communications
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