Riverside Drive is a north–south avenue in the New York City borough of Manhattan. The road runs on the west side of Upper Manhattan, generally paralleling the Hudson River and Riverside Park between 72nd Street and the vicinity of the George Washington Bridge at 181st Street. North of 96th Street, Riverside Drive is a wide divided roadway. At several locations, a serpentine service road diverges from the main road, providing access to the residential buildings. Several viaducts connect the various segments of Riverside Drive, including the 2,047-foot (624 m) Manhattan Valley Viaduct between Tiemann Place and 135th Street. A disconnected section of Riverside Drive exists in Inwood, Manhattan. The New York City Landmarks Preservation Commission has designated the original section of Riverside Drive, between 72nd and 125th streets, as part of a scenic landmark that also includes Riverside Park.