Purpose and Need

The purpose of the I-5/4th Street and 88th Street NE Corridor Improvements Project is to support economic vitality and livability for the Tulalip Tribes, indirectly supporting the neighboring jurisdictions of the City of Marysville and Snohomish County, by reducing congestion and improving mobility to, from, and across I-5 at the 88th Street NE and 4th Street/State Route 528/Marine Drive interchange areas.

I-5/4th Street Interchange

During the morning commute traffic on 4th Street is stop and go approaching the I-5 interchange, due to congestion on I-5 southbound. This affects traffic leaving both Tulalip and Marysville.

During the evening commute congestion builds under I-5 where 4th Street is a single lane in each direction. The result is significant congestion along 4th Street and up the off ramps.

aerial view of the I5 / 4th Street interchange showing in red the areas of traffic congestion in the morning

I-5/88th Street Interchange

Extensive congestion occurs leaving Quil Ceda Village. In the future as the interchange congestion increases, congestion will worsen entering Quil Ceda Village. Traffic backups on 88th Street NE in Marysville will back up onto I-5 off-ramp, blocking traffic exiting to Tulalip.

aerial view of the I5 / 88th Street NE interchange showing in red the areas of traffic congestion