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I-405 - Construction Updates

Last update: 10:01 a.m. Tuesday, Sept. 27

This information changes frequently. Please check back often. Travelers can also call 5-1-1 for real-time traffic and weather updates.

If you have questions or comments about I-405 in Washington state that are not addressed by these resources, please contact the I-405 Project Office at 425-456-8585.

I-405

SB S 320th St to Duwamish River Br Concrete Pavement Rehab - #8816

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 0.00
Contact: Mike Askarian, Project Engineer, 206-768-5861
Description: WSDOT contractor crews are rehabilitating southbound I-5 between the Duwamish River Bridge in Tukwila and South 320th Street in Federal Way.
Project website
Work schedule:

  • **HIGH IMPACT** Sunday, Sept. 25, to the morning of Friday, Sept. 30 - The southbound I-5 ramp to northbound I-405 will be closed from 9 p.m. to 5 a.m. nightly. A signed detour will be in place. This work is weather dependent.
  • **HIGH IMPACT** Sunday, Sept. 25, to the morning of Friday, Sept. 30 - The southbound I-405 ramp to southbound I-5 will be closed from 9 p.m. to 5 a.m. nightly. A signed detour will be in place. This work is weather dependent.
I-405/SR 167 Interchange Direct Connector - #8811

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 2.32 - 3.96
Contact: Anne Broache, Communications, 425-450-2729
Description: WSDOT contractor crews are building a new flyover ramp connecting the HOT lanes on SR 167 to the carpool lanes on I-405 in Renton. This ramp will improve traffic flow and safety at this critical interchange.
Project website
Work schedule:

  • No lane or ramp closures are scheduled.
NE 6th Street to I-5 Widening and Express Toll Lanes - #8204

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 13.68 - 30.30
Contact: Anne Broache, Communications, 425-450-2729
Description: WSDOT contractor crews are building an express toll lane system from downtown Bellevue to Lynnwood.
Project website

The Washington State Department of Transportation is a public agency and is subject to the State of Washington's Public Records Act (RCW 42.56). Therefore, public comments and questions may be made available to anyone requesting them for non-commercial purposes.

BLT map

Work schedule:

RAMP CLOSURES

Bellevue area

  • No ramp closures are scheduled.

Kirkland area

  • No ramp closures are scheduled.

Bothell/Lynnwood area

  • Tuesday, Sept. 27, to the morning of Wednesday, Sept. 28 -The southbound I-405 off-ramp to SR 527 will be closed from 11 p.m. to 5 a.m. A signed detour will be in place. 
  • Tuesday, Sept. 27, to the morning of Wednesday, Sept. 28 -The northbound I-405 ramp to northbound I-5 will be closed from 11:59 p.m. to 5 a.m. A signed detour will be in place.

LANE CLOSURES

Bellevue area

  • No lane closures are scheduled.

Kirkland area

  • No lane closures are scheduled.

Bothell/Lynnwood area

  • Tuesday, Sept. 27, to the morning of Wednesday, Sept. 28 - One right lane of southbound I-405 between I-5 and SR 527 will be closed from 8 p.m. to 4:30 a.m.
Bothell Bridge Inspection Work

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 23.67
Contact: Nicole Daniels, Communications, 206-440-4479
Description: WSDOT bridge maintenance crews are inspecting an overpass at the I-405/SR 522 interchange in Bothell.
Work schedule:

  • Saturday, Oct. 15 - The right lane of westbound SR 522 ramp to southbound I-405 will be closed from 6:30 to 9 a.m.
Bothell Pavement Repair Work

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 23.67 - 24.52
Contact: Nicole Daniels, Communications, 206-440-4479
Description: WSDOT maintenance crews are repairing the pavement on various I-405 ramps in Bothell.
Work schedule:

  • Sunday, Sept. 25, to the morning of Tuesday, Sept. 27 - The right lane of the westbound SR 522 ramp to southbound I-405 will be closed from 9 p.m. to 4:30 a.m. nightly. This work is weather dependent.
  • Tuesday, Sept. 27, to the morning of Wednesday, Sept. 28 - The northbound I-405 ramp to eastbound SR 522 will be closed from 11 p.m. to 5 a.m. A signed detour will be in place. This work is weather dependent.
  • Wednesday, Sept. 28, to the morning of Thursday, Sept. 29 - The Northeast 195th Street/Beardslee Boulevard on-ramp to southbound I-405 ramp will be closed from 9 p.m. to 5 a.m. A signed detour will be in place. This work is weather dependent.