SR509 Completion Project Phase I Complete

SeaTac drivers have access to a new route today connecting I5 and 24th Avenue South. This is the first segment of the SR509 Completion Project, a long overdue connection between the existing SR 509 and I5. The new highway will provide more efficient routes for residents, commuters, and freight, and it will keep traffic off our neighborhood streets. It’s good for our economy, it’s good for neighborhoods, and it’s good for our transportation network. While this is only the first segment, which is on time and on budget, it will provide immediate benefits to drivers and relief to our quiet residential streets. The remainder of SR509 is currently planned to open sometime in 2028.