road was not to exceed 1:27. Riverside Avenue's main road would contain two roadways, one for each direction, separated by a median. A pedestrian path and a horse path would run alongside the avenue, and trees would provide shade along the route. Over the following years, work proceeded on Riverside Avenue, with various ramps and stairs to the park as well as a bridle path between 104th and 120th Streets. In 1876 Olmsted was asked to create plans for the design of the avenue as a country drive, but ultimately it was paved. In late 1876, bids were accepted for the paving of Riverside Avenue. Olmsted was ousted as parks superintendent in December 1877. From 1875 to 1910, architects and horticulturalists such as Calvert Vaux and Samuel Parsons laid out the stretch of park/road between 72nd and 125th Streets according to the English gardening ideal, creating the appearance that the park was an extension of the Hudson River Valley. The avenue was opened in 1880 and was well-used by walkers, bikers, and drivers. The viaduct across 96th Street remained incomplete until 1902. In 1908, the avenue was renamed Riverside Drive. Expansion of Riverside Park In the 1930s, New York Central Railroad's rail track north of 72nd Street was covered in a Robert Moses project called the West Side Improvement. Moses' biographer Robert Caro described Moses surveying the area prior to his project, and seeing: The Moses project, which was bigger than the Hoover Dam project, created the Henry Hudson Parkway, buried the West Side Line in the Freedom Tunnel, and greatly expanded Riverside Park. It was so skillfully done that many believe the park and road are set on a natural slope. Riverside Park, part of the Manhattan Waterfront Greenway, is now a scenic waterfront public park on the narrow strip of land between the Hudson River and Riverside Drive. It is approximately . Riverside South In the 1980s Donald Trump, then owner of the of land just south of Riverside Park that had been the Penn Central freight rail yard, proposed a very large real estate development project. However, hampered by his weakened financial condition and opposed by six civic groups (Municipal Art Society, Natural Resources Defense Council, TNew Yorkers for Parks, Regional Plan Association, Riverside Park Fund, and Westpride), Trump agreed in 1990 to their plan, which was designed to mimic Riverside Park and Drive further north. Though