The Riverside Drive Viaduct was built in 1901. The 50-foot tall elevated roadway is an extension of Riverside Drive. The Drive splits into two paths at the terminus of Riverside Park which converge at the entrance to the Viaduct. Aside from a masonry approach on both the north and south entrance, the structure is entirely steel. At the time of its construction, the girders over 125th street were the largest ever built.

F. Stuart Williamson was the chief engineer of the project, which was regarded as a civic monument. The Scientific American referred to Riverside Drive as "a continuous drive of ten miles along the picturesque banks of the Hudson and Harlem Rivers."