125th Street (Manhattan) in the context of "Riverside Drive Viaduct"

Upper Manhattan is the northern section of the New York City borough of Manhattan. Its southern boundary has been variously defined, but some of the most common usages are 96th Street, 110th Street (the northern boundary of Central Park), 125th Street, or 155th Street. The term Uptown can refer to Upper Manhattan, but is often used more generally for neighborhoods above 59th Street; in the broader definition, Uptown encompasses Upper Manhattan.

Upper Manhattan is generally taken to include the neighborhoods of Manhattan Inwood, Washington Heights (including Fort George, Sherman Creek and Hudson Heights), Harlem (including Sugar Hill, Hamilton Heights and Manhattanville), East Harlem, Morningside Heights, and Manhattan Valley (in the Upper West Side).

First Avenue is a north-south thoroughfare on the East Side of the New York City borough of Manhattan, running from Houston Street northbound to 127th Street. At 125th Street, most traffic continues onto the Willis Avenue Bridge over the Harlem River, which continues into the Bronx. South of Houston Street, the roadway continues as Allen Street south to Division Street. Traffic on First Avenue runs northbound (uptown) only.

African Americans constitute one of the longer-running ethnic presences in New York City, home to the largest urban African American population, and the world's largest Black population of any city outside Africa, by a significant margin. As of the 2010 census, the number of African Americans residing in New York City was over 2 million. The highest concentration of African Americans are in Brooklyn, Harlem, Queens, and The Bronx. New York City is also home to the highest number of immigrants from the Caribbean.

Since the earlier part of the 19th century, there has been a large presence of African Americans in New York City. Early Black communities were created after the state's final abolition of slavery in 1827. The metropolis quickly became home to one of the most sizeable populations of emancipated African Americans. But Blacks did not receive equal voting rights in New York until the ratification of the Fifteenth Amendment of the Constitution in 1870. New York City and other northern cities saw a sharp rise in their Black populations in the wake of Jim Crow in the South. In the early 1900s, many African Americans moved to Harlem, due to a number of factors, including many Black migrants relocating from the South to the North. But the demographic shift would change once again in the 20th century. In 1936, overcrowding in Harlem caused scores of African Americans to leave and move to Bedford-Stuyvesant, which eventually became the second largest Black community in New York City.

Manhattanville (also known as West Harlem or West Central Harlem, after its location near Harlem) is a neighborhood in the New York City borough of Manhattan. It is bordered on the north by 135th Street; on the south by 122nd and 125th Streets; on the west by Hudson River; and on the east by Adam Clayton Powell Jr. Boulevard and the campus of City College.

Throughout the nineteenth century, Manhattanville bustled around a wharf active with ferry and daily river conveyances. It was the first station on the Hudson River Railroad running north from the city, and the hub of daily stage coach, omnibus and streetcar lines. Situated near Bloomingdale Road, its hotels, houses of entertainment and post office made it an alluring destination of suburban retreat from the city, yet its direct proximity to the Hudson River also made it an invaluable industrial entry point for construction materials and other freight bound for Upper Manhattan. With the construction of road and railway viaducts over the valley in which the town sat, Manhattanville, increasingly absorbed into the growing city, became a marginalized industrial area. In the early 2000s, the neighborhood became the site of a major planned expansion of Columbia University, which has campuses in Morningside Heights to the south and Washington Heights to the north.

Morningside Heights is a neighborhood on the West Side of Upper Manhattan in New York City. It is bounded by Morningside Drive to the east, 125th Street to the north, 110th Street to the south, and Riverside Drive to the west. Morningside Heights borders Central Harlem and Morningside Park to the east, Manhattanville to the north, the Manhattan Valley section of the Upper West Side to the south, and Riverside Park to the west. Broadway is the neighborhood's main thoroughfare, running north–south.

Morningside Heights, located on a high plateau between Morningside and Riverside Parks, was hard to access until the late 19th century and was sparsely developed except for the Bloomingdale and Leake and Watts asylums. Morningside Heights and the Upper West Side were considered part of the Bloomingdale District until Morningside Park was finished in the late 19th century. Large-scale development started in the 1890s with academic and cultural institutions. By the 1900s, public transportation construction and the neighborhood's first subway line led to Morningside Heights being developed into a residential neighborhood. Morningside Heights was mostly developed by the 1930s. During the mid-20th century, as the institutions within Morningside Heights expanded, cultural tensions grew between residents who were affiliated with institutions and those who were not. After a period of decline, the neighborhood started to gentrify in the 1980s and 1990s.

Franklin D. Roosevelt East River Drive, commonly known as the FDR Drive, is a controlled-access parkway on the east side of the New York City borough of Manhattan. It starts near South and Broad Streets, just north of the Battery Park Underpass, and runs north along the East River to the 125th Street / Robert F. Kennedy Bridge interchange, where it becomes Harlem River Drive. All of FDR Drive is designated New York State Route 907L (NY 907L), an unsigned reference route.

FDR Drive features a mix of below-grade, at-grade, and elevated sections, as well as three partially covered tunnels. The parkway is mostly three lanes in each direction, except for several small sections.