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I-405 - Construction Updates

Last update: 1:40 p.m. Friday, April 20

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

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 webpage
Work schedule:

LANE CLOSURES

  • Monday, April 23, to the morning of Friday, April 27 – Two lanes of northbound I-405 between SR 167 and Talbot Road South will be closed nightly from midnight to 4:15 a.m.
  • Monday, April 23, to the morning of Friday, April 27 – Two lanes of southbound I-405 between SR 169/SR 900 and SR 167 will be closed nightly from midnight to 4 a.m.

RAMP CLOSURES

  • * Monday, April 23, to the morning of Friday, April 27 – 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, April 23, to the morning of Friday, April 27 – The southbound I-405 ramp to southbound SR 167/Rainier Avenue South will be closed nightly from 10 p.m. to 4:30 a.m. A signed detour will be in place.
  • * Monday, April 23, to the morning of Friday, April 27 – The northbound I-405 ramp to southbound SR 167 will be closed nightly from 10 p.m. to 4:30 a.m. A signed detour will be in place.
  • * Monday, April 23, to the morning of Friday, April 27 – The northbound I-405 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.

    *Please note that not all the listed ramps will be closed at the same time. Select ramps will remain open to maintain a working detour for the traveling public.

CITY STREET CLOSURES

  • Monday, April 16, to the afternoon of Friday, April 20 – One lane of northbound Talbot Road South between the northbound I-405 on-ramp and the southbound I-405 off-ramp will be closed daily from 9 a.m. to 3 p.m.
  • Monday, April 16, to the afternoon of Friday, April 20 – One lane of the Talbot Road South on-ramp to northbound I-405 will be closed daily from 9 a.m. to 3 p.m.
  • Monday, April 23, to the afternoon of Friday, April 27 – One lane of northbound Talbot Road South between the northbound I-405 on-ramp and the southbound I-405 off-ramp will be closed daily from 9 a.m. to 3 p.m.
  • Monday, April 23, to the afternoon of Friday, April 27 – One lane of southbound Talbot Road South between the northbound I-405 on-ramp and the southbound I-405 off-ramp will be closed daily from 4:30 a.m. to noon.
  • Monday, April 23, to the afternoon of Friday, April 27 – One lane of the Talbot Road South on-ramp to northbound I-405 will be closed daily from 9 a.m. to 3 p.m.
  • Monday, April 23, to the morning of Friday, April 27 – Talbot Road South between the northbound I-405 on-ramp and the southbound I-405 off-ramp will be FULLY CLOSED nightly from 10 p.m. to 4:30 a.m. Signed detours for both the southbound and northbound directions of Talbot Road South will be in place.
SB SR 900 to Coal Creek Pkwy SE Paving Outside Lane - #9178

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 10.65
Contact: Mark Sawyer, Project Engineer, 425-225-8799
Description: WSDOT construction crews are repaving nearly 6 miles of the right lane of southbound I-405 between Coal Creek Parkway Southeast and SR 900 as well as a portion of the on and off-ramps along that stretch of interstate.
Project webpage
Work schedule:

  • Construction is scheduled to begin in spring 2018.
Sound Transit's East Link Extension - E335

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 10.65 - 14.85
ContactJay Cooper, WSDOT Regional Transit Coordination, 206-716-1102; Ryan Lescouflair, Sound Transit, 206-689-4798
Description: Sound Transit crews are constructing the East Link light rail extension from Seattle to Redmond.
Project webpage
Work schedule:

LANE CLOSURES

  • No lane closures are scheduled.

RAMP CLOSURES

  • No ramp closures are scheduled.