I-5 - Skagit River Bridge Replacement - Retrofit stage

New support installation

WSDOT upgraded the I-5 Skagit River Bridge’s overhead supports to reduce the risk of another over-height load striking the structure.

Before this work was completed, drivers traveling over the Skagit Bridge would have noticed that the steel support structures above the travel lanes were arched. This meant that the vertical clearance over the bridge’s center lanes was higher than the vertical clearance over the outside lanes. The bridge’s highest vertical clearance was located above the center lanes and measured 18 feet, while the vertical clearance above the right lanes measured 15 feet 6 inches at the fog line.

In summer 2014, WSDOT contractor PCL Constructors completed work to raise the overhead support structure to an 18-foot vertical clearance across all lanes. Several sections of the bridge were retrofitted with reinforced steel components to add strength in case the bridge is struck again.