I-5 - 116th St NE Interchange - Tulalip Tribes Lead - Complete October 2020

The Tulalip Tribes reconstructed the existing Interstate 5 interchange at 116th Street Northeast into a new single-point urban interchange (SPUI). This configuration increases capacity, reduces delays and improves turning movements to allow more vehicles through the interchange in a single light cycle. The Tulalip Tribes took the lead in planning this four phase transportation improvement project. Partners included WSDOT, the Federal Highway Administration, Bureau of Indian Affairs, Snohomish County and the City of Marysville. This is the fourth and final phase in the diamond interchange replacement project on Interstate 5 at 116th Street Northeast. 

Previous phases:

  • Extended Quil Ceda Boulevard northerly from the intersection with 116th Northeast to 34th Avenue Northeast.
  • A portion of 34th Avenue Northeast was realigned to the west to intersect Quil Ceda Boulevard in a roundabout configuration.
  • Culverts under 34th Avenue Northeast and 116th Street Northeast were replaced.
  • Quilceda Creek was realigned.
  • A mitigation site for the entire interchange project was completed.
  • The 3-lane 116th Street Northeast bridge over I-5 was reconstructed with a 6-lane span.
  • Safety improvements such as temporary signals were installed as well as retaining walls and noise walls.


February 2018: Construction began.
​October 2020: Construction complete.


WSDOT’s contribution to this project was $15.49 million.


Northwest Region Communications
15700 Dayton Avenue North
Seattle, WA 98133


Location of the I-5/116th Street Northeast interchange project.