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I-405 - Construction Updates

Last update: 1:10 p.m. Friday, Feb. 16

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, Feb. 12, to the morning of Sunday, Feb. 18 – Two lanes of southbound I-405 from SR 169/SR 900 to SR 167 will be closed nightly from midnight to 4 a.m.
  • Monday, Feb. 19, to the morning of Friday, Feb. 23 – Two lanes of southbound I-405 from SR 169/SR 900 to SR 167 will be closed nightly from midnight to 4 a.m.
  • Tuesday, Feb. 20, to the morning of Friday, Feb. 23 – Two lanes of northbound I-405 from SR 167 to Talbot Road South will be closed nightly from 11 p.m. to 5 a.m.

RAMP CLOSURES

  • * Monday, Feb. 12, to the morning of Sunday, Feb. 18 – The southbound I-405 ramp to southbound SR 167/Rainier Ave. South will be closed nightly from 10 p.m. to 4:30 a.m. A signed detour will be in place.
  • * Monday, Feb. 19, to the morning of Friday, Feb. 23 – The southbound I-405 ramp to southbound SR 167/Rainier Ave. South will be closed nightly from 10 p.m. to 4:30 a.m. A signed detour will be in place.
  • * Tuesday, Feb. 20, to the morning of Friday, Feb. 23 – 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.
  • * Tuesday, Feb. 20, to the morning of Friday, Feb. 23 – The southbound I-405 off-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.
  • * Tuesday, Feb. 20, to the morning of Friday, Feb. 23 – 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.
  • * Tuesday, Feb. 20, to the morning of Friday, Feb. 23 – 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, Feb. 12, to the afternoon of Friday, Feb. 16 – One lane of northbound Talbot Road South between the northbound I-405 on-ramp and the southbound I-405 off-ramp will be closed from 9 a.m. to 3 p.m.
  • Monday, Feb. 12, to the afternoon of Friday, Feb. 16 – One lane of northbound East Valley Road between Southwest 19th Street and Maple Ave. Southwest will be closed from 8:30 a.m. to 3 p.m.
  • Tuesday, Feb. 20, to the afternoon of Friday, Feb. 23 – One lane of northbound Talbot Road South between the northbound I-405 on-ramp and the southbound I-405 off-ramp will be closed from 9 a.m. to 3 p.m.
  • Tuesday, Feb. 20, to the afternoon of Friday, Feb. 23 – One lane of southbound Talbot Road South between the northbound I-405 on-ramp and the southbound I-405 off-ramp will be closed from 4:30 a.m. to noon.
  • Tuesday, Feb. 20, to the afternoon of Friday, Feb. 23 – One lane of northbound East Valley Road between the Southwest 19th Street and Maple Ave. Southwest will be closed from 8:30 a.m. to 3 p.m.
  • Wednesday, Feb. 21, to the afternoon of Friday, Feb. 23 – One lane of the Southwest 41st Street on-ramp to southbound SR 167 will be closed from 5 a.m. to 1 p.m.
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.
NE 6th St to I-5 Widening and Express Toll Lanes - #8886

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 27.00 - 28.00
Contact: Craig Smiley, Communications, 425-456-8624
Description: WSDOT contractor crews are replacing a traffic camera adjacent to the southbound I-405 express toll lane.
Project webpage
Work schedule:

  • Tuesday, Feb. 20, to the morning of Wednesday, Feb. 21 - The southbound I-405 express toll lane between I-5 and SR 527 will be closed from 8:30 p.m. to 4:30 a.m.