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I-405 - Construction Updates

Last update: 11:30 a.m. Wednesday, May 24

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:

  • No lane or ramp closures are scheduled.
I-405/SR 167 Interchange Direct Connector - #8811

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 2.32 – 3.96
Contact: Craig Smiley, Communications, 425-456-8624
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:

LANE CLOSURES 

  • Monday, May 22, to the morning of Friday, May 26 – One lane of northbound SR 167 from South 180th Street to I-405 will be closed from 9 p.m. to 4:30 a.m.
  • Monday, May 22, to the morning of Friday, May 26 – One lane of northbound I-405 from SR 167 to Talbot Road South will be closed nightly from 10 p.m. to 4:30 a.m.
  • Monday, May 22, to the morning of Friday, May 26 – Two lanes of southbound I-405 from Talbot Road South to SR 167 will be closed nightly from 11 p.m. to 4:30 a.m.
  • Monday, May 22, to the morning of Wednesday, May 24 – Rolling slowdowns are scheduled on northbound and southbound I-405 between SR 167 and Talbot Road from 12 a.m. to 4 a.m.

RAMP CLOSURES

  • Monday, May 22, to the morning of Friday, May 26 – The Talbot Road South on-ramp to northbound I-405 will be closed nightly from 10 p.m. to 4:30 a.m. A signed detour will be in place.
  • Monday, May 22, to the morning of Friday, May 26 – The South 180th Street on-ramp to northbound SR 167 will be closed nightly from 10 p.m. to 4:30 a.m. A signed detour will be in place.
  • Monday, May 22, to the morning of Friday, May 26 – The southbound I-405 ramp to Talbot Road South will be closed nightly from 10 p.m. to 4:30 a.m. A signed detour will be in place.

CITY STREET CLOSURES

  • Monday, May 22, to Friday, May 26 – The northbound East Valley Road between Southwest 23rd Street and Southwest 19th Street will be diverted to the center turn lane from 8:30 a.m. to 3:30 p.m.
Northbound Peak Use Shoulder Lane Project, SR 527 to I-5 - #8886

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 23.67 - 30.30
Contact: Craig Smiley, Communications, 425-450-2729
Description: WSDOT contractor crews are building a peak-use shoulder lane between SR 527 and I-5.
Project website
Work schedule:

  • Tuesday, May 23, to the morning of Thursday, May 25 – Up to two left lanes of northbound I-405 between Northeast 195th Street and SR 527 will be closed from 7 p.m. to 6 a.m. This work is weather dependent.