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I-405 - Construction Updates

Last update: 2:40 p.m. Tuesday, Aug. 14

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, Aug. 13, to the morning of Wednesday, Aug. 15 – Three lanes of northbound I-405 between SR 167 and Talbot Road South will be closed nightly from midnight to 4:30 a.m.
  • ** HIGH IMPACT ** Friday, Aug. 17, to the morning of Monday, Aug. 20 – Three lanes of northbound I-405 between SR 167 and Talbot Road South will be closed 11 p.m. on Friday to 4:30 a.m. on Monday.
  • Wednesday, Aug. 15, to the morning of Friday, Aug. 17 – Two lanes of northbound I-405 between SR 167 and the Benson Bridge and will be closed nightly from midnight to 4:30 a.m.
  • Monday, Aug. 13, to the morning of Saturday, Aug. 18 – Two lanes of southbound I-405 between the Benson Bridge and SR 167 will be closed nightly from 11 p.m. to 4 a.m.
  • Monday, Aug. 13, to the morning of Friday, Aug. 17 – Northbound I-405 will shift the right mainline lanes to the left lanes between SR 167 and the Benson Bridge nightly from midnight to 4:30 a.m.
  • Monday, Aug. 13, to the morning of Friday, Aug. 17 – Two lanes of northbound I-405 between SR 167 and Talbot Road South will be closed nightly from 11 p.m. to 4:30 a.m.
  • Monday, Aug. 13, to the morning of Monday, Aug. 20 – Rolling slowdowns are scheduled on northbound I-405 between SR 167 and Talbot Road South nightly from midnight to 4 a.m.

RAMP CLOSURES

  • * Monday, Aug. 13, to the morning of Friday, Aug. 17 – The northbound I-405 off-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, Aug. 13, to the morning of Friday, Aug. 17 – The northbound I-405 off-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, Aug. 13, to the morning of Friday, Aug. 17 – The northbound SR 167 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, Aug. 13, to the morning of Friday, Aug. 17 – The southbound I-405 off-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.
  • * Wednesday, Aug. 15, to the morning of Monday, Aug. 20 – The southbound SR 167 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, Aug. 13, to the morning of Friday, Aug. 17 – The Talbot Road South 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.
  • * Friday, Aug. 17, to the morning of Saturday, Aug. 18 – The northbound I-405 ramp to northbound SR 167 will be closed from 11 p.m. Friday to 5 a.m. Saturday. 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, Aug. 13, to the afternoon of Friday, Aug. 17 – 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, Aug. 13, to the afternoon of Friday, Aug. 17 – 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 3:30 p.m.
  • Monday, Aug. 13, to the afternoon of Friday, Aug. 17 – The intersection of East Valley Road and Southwest 19th Street will be closed from 7 a.m. to 5 p.m. One lane of East Valley Road will remain open with flaggers directing traffic through the work site.
  • Thursday, Aug. 16, to the morning of Friday, Aug. 17 – The East Valley Road will be reduced to one lane between Southwest 19th Street and Taylor Ave. Southwest from 8 p.m. to 7 a.m. One lane of East Valley Road will remain open with flaggers directing traffic through the work site.
S 188th St to NE 80th St Camera Installation - #9147

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 4.50 - 10.18
Contact: Mark Sawyer, Project Engineer, 425-225-8799
Description: WSDOT contractor crews are installing cameras along I-405 between Coal Creek Parkway in Factoria and Northeast 3rd Street in Renton.
Work schedule:

  • No lane or ramp closures are scheduled.
SB SR 900 to Coal Creek Pkwy SE Paving Outside Lane - #9216

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:

  • This project is complete.
Sound Transit's East Link Extension - E320

Highway: I-90    Region: Northwest    County: King    Location: Milepost(s) 10.65
Contact: Jason Hampton, Sound Transit, 206-903-7177
Description: Sound Transit crews are constructing the East Link light rail extension from Seattle to Redmond.
Project webpage
Work schedule:

  • No lane or ramp closures are scheduled.
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.
Bellevue to Alderwood Tolling Maintenance Work

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 13.78 - 29.18
Contact: Eric Knigge, WSDOT Maintenance, 206-464-1194
Description: WSDOT crews are performing maintenance on the I-405 express toll lanes between Bellevue and Alderwood.
Work schedule:
 
LANE CLOSURES 

  • Tuesday, Aug. 14, to the morning of Wednesday, Aug. 15 – Up to two express toll lanes on northbound I-405 between Northeast 85th Street and Northeast 128th Street will be closed from 9 p.m. to 5 a.m.
  • Wednesday, Aug. 15, to the morning of Thursday, Aug. 16 – The express toll lane on northbound I-405 between Northeast 160th Street and SR 527 will be closed from 9 p.m. to 5 a.m.
  • Thursday, Aug. 16, to the morning of Friday, Aug. 17 – The express toll lane on both directions of I-405 between I-5 and SR 527 will be closed from 9 p.m. to 5 a.m.
  • Monday, Aug. 20, to the morning of Tuesday, Aug. 21 – Up to two express toll lanes on southbound I-405 between SR 527 and Northeast 160th Street will be closed from 9 p.m. to 5 a.m.
  • Tuesday, Aug. 21, to the morning of Wednesday, Aug. 22 – Up to two express toll lanes on southbound I-405 between Northeast 160th Street and Northeast 128th Street will be closed from 9 p.m. to 5 a.m.
  • Wednesday, Aug. 22, to the morning of Thursday, Aug. 23 – Up to two express toll lanes on southbound I-405 will be closed between Northeast 70th Place and SR 520 from 9 p.m. to 5 a.m.
  • Thursday, Aug. 23, to the morning of Friday, Aug. 24 – The express toll lane on southbound I-405 between SR 520 and Northeast Sixth Street will be closed from 9 p.m. to 4:30 a.m.

RAMP CLOSURES

  • Tuesday, Aug. 14, to the morning of Wednesday, Aug. 15 – The northbound I-405 off-ramp to Northeast 128th Street will be closed from 9 p.m. to 5 a.m.
  • Tuesday, Aug. 14, to the morning of Wednesday, Aug. 15 – The Northeast 128th Street on-ramp to northbound I-405 will be closed from 9 p.m. to 5 a.m.
  • Tuesday, Aug. 21, to the morning of Wednesday, Aug. 22 – The southbound I-405 off-ramp to Northeast 128th Street will be closed from 9 p.m. to 4:30 a.m.
  • Tuesday, Aug. 21, to the morning of Wednesday, Aug. 22 – The Northeast 128th Street on-ramp to southbound I-405 will be closed from 9 p.m. to 4:30 a.m.
  • Thursday, Aug. 23, to the morning of Friday, Aug. 24 – The southbound I-405 off-ramp to Northeast Sixth Street will be closed from 9 p.m. to 4:30 a.m.
  • Thursday, Aug. 23, to the morning of Friday, Aug. 24 – The Northeast Sixth Street on-ramp to northbound I-405 will be closed from 9 p.m. to 4:30 a.m.