Interstate Bridge

The Interstate Bridge is a pair of nearly identical steel vertical-lift, Parker through-truss bridges that carry Interstate 5 traffic over the Columbia River between Vancouver, Washington and Portland, Oregon in the United States.

The present-day northbound bridge opened to traffic in 1917 as a single bridge carrying two-way traffic. A second twin bridge, which carries southbound traffic, opened in 1958. The twin bridges are each over 3,500 feet long and carry three lanes of traffic. The bridges handle a combined 130,000 vehicles daily. It was added to the National Register of Historic Places in 1982, as the "Portland–Vancouver Highway Bridge".