I-5 - MTB Cantilever Signs and Landscaping

Project news

Needs & benefits

Why is WSDOT resurfacing the highway and repairing the bridge?

This project series improves safety throughout a total of five miles of I-5 between Mellen Street (Exit 81) and just north of the Harrison Ave. interchange (Exit 82) in Lewis County. 

In spring 2018, contractor crews working for the Washington State Department of Transportation will erect two "Exit Only" cantilever signs over the right lane on southbound I-5, for the off-ramp to Harrison Avenue/Exit 82, remove and replace damaged guardrail, and add new landscaping at both the Harrison Avenue and Mellen Street interchanges. 

In an effort improve safety on I-5; crews will work on both directions of I-5. During construction, crews will remove and replace the failing waterproof membrane on the northbound span of the I-5 over Harrison Avenue overpass. Additionally, crews will restripe the right lane on southbound I-5, just before Harrison Avenue/Exit 82, reconfiguring it from a taper lane to a drop lane. This drop lane gives travelers on southbound I-5 a separate deceleration lane as they exit from southbound I-5 to Harrison Avenue/Exit 82. 

I-5 is the most significant freight freeway on the West Coast. The interstate links markets in Canada, the United States and Mexico, and is critical to the regional, state and national economy. This stretch of I-5 sees approximately 68,000 vehicles per day.


  • Winter 2017: Project goes to competitive bid
  • Spring/summer 2018: Construction begins
  • Fall 2019: Project is scheduled to be complete


Colin Newell
WSDOT Project Engineer

Celeste Dimichina
WSDOT Communications

Interstate 5 in Centralia between Mellen Street and Harrison Avenue