The Franklin Avenue Bridge, officially the F.W. Cappelen Memorial Bridge, carries Franklin Avenue over the Mississippi River in Minneapolis, Minnesota. It was designed by Frederick William Cappelen, assisted by Kristoffer Olsen Oustad, both of whom were among four important Norwegian-American engineers working in the region at the time. The reinforced-concrete open-spandrel arched structure was completed in 1923. The bridge's overall length is 1054.7 feet (321.47 m), with a central span of 400 feet (122 m). It was added to the National Register of Historic Places in 1978 along with several other area bridges as part of a multiple-property submission. At the time of its completion, the bridge's central span was the longest concrete arch in the world.