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Nighttime closures of off-ramp to westbound State Route 104 and off-ramp to SR 104 eastbound 

Publish Date

As early as Monday, August 10, Sound Transit’s contractor will continue night work at the State Route (SR) 104 and NB I-5 interchange. Both the off-ramps and on the off-ramps will be closed while this work is underway. Detours will be provided (see map). The contractor has obtained a Temporary Noise Variance to complete this work. This work is weather-dependent and may need to be rescheduled. 


Preparatory work for a temporary signal at SR104 and work for future guideway columns from exit 177 to Mountlake Terrace. Work will include mobilization/demobilization of equipment, electrical work, striping, earthwork, drilling, concrete forming and trucking and related activities. 


Monday, August 10, through Friday, August 21. Monday – Friday 10:00 pm to 7:00 am. Nighttime Closure/detours: Monday, 8:00 p.m. – Fridays, 4:00 a.m. 


  • Northbound I-5 off ramp to Westbound SR 104.
  • Northbound I-5 off ramp to Eastbound SR 104.
  • Eastbound SR 104 on ramp to Northbound I-5.
  • Westbound SR 104 to on ramp for Northbound I-5.


  • There will be posted signs for the detours (see map). 
  • Plan ahead, leave early and allow extra time to reach your destination.
  • Please be prepared for delays while this work takes place.  

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Thank you for your patience as we work to bring high-capacity light rail service to Snohomish County, providing a traffic free link from Lynnwood to downtown Seattle in 27 minutes.

SR 104 Ramp closure detours map