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.

Vancouver is a city on the north bank of the Columbia River in the U.S. state of Washington, located in Clark County. Founded in 1825 and incorporated in 1857, Vancouver had a population of 190,915 as of the 2020 census, making it the fourth-most populous city in Washington state. Vancouver is the seat of government of Clark County and forms part of the Portland-Vancouver metropolitan area, the 25th-largest metropolitan area in the United States. Originally established in 1825 around Fort Vancouver, a fur-trading outpost, the city is located on the Washington–Oregon border along the Columbia River, directly north of Portland, and is considered a suburb of the city along with its surrounding areas.