Drivers heading to and from Seattle will see delays beginning next month, as the Washington State Department of Transportation begins construction of new culverts on both lanes of Interstate 5 between Arlington and Stanwood in Snohomish County.
In February, I-5 will be reduced to two lanes, and starting in May, drivers in both directions will be shifted onto a temporary two-lane bypass road for nine months. Construction on the interstate is supposed to wrap up in early 2026, before FIFA World Cup traffic starts in June.
In 2026, Old Highway 99 which runs parallel to I-5, will close for six months. Local and freight traffic will be diverted onto the interstate, or local drivers can use 4th Avenue NW. Project updates are available at WSDOT’s Secret Creek project page…