SR 18 is a crucial highway connecting the south Puget Sound area with I-90, the state's main east-west route. SR 18 has experienced frequent congestion and collisions for decades.
We are receiving construction funding from the 2022 Move Ahead Washington transportation package and preparing to widen a 5-mile section of SR 18 between Issaquah-Hobart Road and Deep Creek.
What to expect
We anticipate it will take several construction seasons to complete the work because we will keep the highway open during construction. The project is being readied for construction, which could begin as early as 2025 and last until 2029.