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Map of Westchester County in southeastern New York with NY 100A highlighted in red | ||||
Route information | ||||
Auxiliary route of NY 100 | ||||
Maintained by NYSDOT | ||||
Length | 4.21 mi [1] (6.78 km) | |||
Existed | 1930[ citation needed ]–present | |||
Major junctions | ||||
South end | ![]() | |||
![]() | ||||
North end | ![]() ![]() ![]() | |||
Location | ||||
Country | United States | |||
State | New York | |||
Counties | Westchester | |||
Highway system | ||||
|
New York State Route 100A (NY 100A) is a 4.21-mile (6.78 km) loop route of NY 100 in Westchester County, New York, in the United States. It follows West Hartsdale Avenue and Knollwood Road in the town of Greenburgh. The route starts in the hamlet of Hartsdale and ends in the community of Grasslands at the boundary between the towns of Greenburgh and Mount Pleasant.
NY 100A begins at an intersection with NY 100 (Central Park Avenue) in the town of Greenburgh, a short distance north of Hartsdale. NY 100A winds northwest through the hills of Greenburgh as West Hartsdale Avenue, passing multiple residences on its way up. Just after Woods End Lane, the route turns northward through Greenburgh, passing Ridge Road County Park and the Metropolis Country Club before reaching a junction with NY 100B (Dobbs Ferry Road). At this junction, NY 100A changes monikers to Knollwood Road, winding northward through Greenburgh into a junction with NY 119 as it crosses into the village of Elmsford. [2]
After NY 119, NY 100A passes Yosemite Park and enters exit 4 off the Cross Westchester Expressway (I-287). NY 100A continues northeast through Elmsford, running along the southeastern edge of the Knollwood Country Club and passing an entrance to Westchester Community College. After passing the entrance, the route winds northward through Greenburgh, passing multiple residences before reaching a junction with NY 100 (Grasslands Road) and NY 100C (Grasslands Road) just east of the Sprain Brook Parkway. This junction marks the northern terminus of NY 100A and the eastern terminus of NY 100C, with NY 100 turning north onto Bradhurst Avenue, the continuation of Knollwood Road. Several blocks away from this junction is the Kensico Cemetery. [2]
NY 100A was designated in the 1930 state highway renumbering and has not had any major changes since.
The entire route is in Westchester County.
Location | mi [1] | km | Destinations | Notes | |
---|---|---|---|---|---|
Hartsdale | 0.00 | 0.00 | ![]() | Southern terminus | |
Greenburgh | 1.52 | 2.45 | ![]() | ||
Elmsford | 2.21 | 3.56 | ![]() | Interchange | |
2.33 | 3.75 | ![]() | Exit 4 on I-287; former I-487 | ||
Greenburgh–Mount Pleasant line | 4.21 | 6.78 | ![]() ![]() ![]() ![]() | Northern terminus; eastern terminus of NY 100C | |
1.000 mi = 1.609 km; 1.000 km = 0.621 mi |
Greenburgh is a town in western Westchester County, New York. The population was 95,397 at the time of the 2020 census. The town consists of 6 villages and an unincorporated area.
The Saw Mill River Parkway is a limited-access parkway that extends for 29.83 miles (48.01 km) through Westchester County, New York, in the United States. It begins at the border between Westchester County and the Bronx, as the continuation of the Henry Hudson Parkway leaving New York City, and heads generally northeastward to an interchange with Interstate 684 (I-684). At its north end, the parkway serves as a collector/distributor road as it passes east of the hamlet of Katonah. The parkway is named for the Saw Mill River, which the highway parallels for most of its length.
The Sprain Brook Parkway is a 12.65-mile (20.36 km) controlled-access parkway in Westchester County, New York, United States. It begins at the Bronx River Parkway in the city of Yonkers, and ends at the Taconic State Parkway in Hawthorne. The parkway serves an alternate to the Bronx River Parkway, boasting an interchange connection through western Westchester with Interstate 287. New York's Department of Transportation (NYSDOT) refers to it internally as New York State Route 987F (NY 987F), an unsigned reference route.
New York State Route 9A (NY 9A) is a state highway in the vicinity of New York City in the United States. Its southern terminus is at Battery Place near the northern end of the Brooklyn–Battery Tunnel in New York City, where it intersects with both the unsigned Interstate 478 (I-478) and FDR Drive. The northern terminus of NY 9A is at U.S. Route 9 (US 9) in Peekskill. It is predominantly an alternate route of US 9 between New York City and Peekskill; however, in New York City, it is a major route of its own as it runs along the West Side Highway and Henry Hudson Parkway. It is also one of only two signed New York State routes in Manhattan. In northern Westchester County, NY 9A follows the Briarcliff–Peekskill Parkway.
New York State Route 433 (NY 433) is a state highway located entirely in the town of North Castle in Westchester County, New York, United States. It runs for 0.70 miles (1.13 km) from the Connecticut state line, where it continues south into Greenwich as Riversville Road, to an intersection with NY 22 near the hamlet of Armonk. NY 433 is one of six New York touring routes less than one mile (1.6 km) in length. The route was originally designated as part of NY 128 in the 1930s. NY 128 was truncated to its junction with NY 22 in Armonk in January 1971, at which time its former routing along North Greenwich Road was redesignated as NY 433.
New York State Route 240 (NY 240) is a 51.64-mile (83.11 km) state highway in western New York in the United States. The southern terminus of the route is at an intersection with NY 242 in the Ellicottville community of Ashford Junction in northern Cattaraugus County. Its northern terminus is at a junction with NY 324 and Interstate 290 (I-290) in Amherst in northern Erie County. The route passes through the villages of Springville and Orchard Park, where it meets NY 39 and U.S. Route 20A (US 20A), respectively. Much of NY 240 between Concord and Aurora follows the west branch of Cazenovia Creek. The northern part of NY 240 in Erie County, named Harlem Road, is a major north–south route through the suburbs east of the city of Buffalo.
New York State Route 100 (NY 100) is a major north–south state highway in Westchester County, New York, in the United States. It begins parallel to Interstate 87 (I-87) at a junction with the Cross County Parkway in the city of Yonkers and runs through most of the length of the county up to U.S. Route 202 (US 202) in the town of Somers. NY 100 was designated as part of the 1930 renumbering of state highways in New York. Prior to becoming a state road, various sections of NY 100 were part of several important early roads in the county.
New York State Route 119 (NY 119) is an east–west state highway in Westchester County, New York, in the United States. The road starts in Tarrytown at an intersection with U.S. Route 9 (US 9) and comes to an end at a junction with NY 22 in White Plains. The road is a major thoroughfare in the county and provides access to the New York State Thruway, Saw Mill River Parkway, Sprain Brook Parkway and Bronx River Parkway, four of the major roads in the county. NY 119 closely parallels Interstate 287 (I-287) and connects to the highway multiple times. The route was assigned in the 1930 renumbering of state highways in New York and once had a spur route, NY 119A. That highway is now part of NY 120.
New York State Route 120 (NY 120) is a state highway in southern Westchester County, New York, in the United States. It begins in the city of Rye at an intersection with U.S. Route 1 (US 1) and runs for about 18 miles (29 km) north to the hamlet of Millwood, where it ends at a junction with NY 100. The route intersects with Interstate 684 (I-684) and the Saw Mill River Parkway, and serves the Westchester County Airport in North Castle. Portions of the route have been signed ceremonially in remembrance of American serviceman killed in the 2000s and 2010s during the wars in Iraq and Afghanistan.
New York State Route 120A (NY 120A) is a state highway in southern Westchester County, New York, in the United States. It serves as an alternate route to the southern half of NY 120 running along the New York–Connecticut state line. The southern terminus of the route is at NY 120 in Harrison. Its northern terminus is at NY 120 in North Castle. Most of the 8.55-mile (13.76 km) route straddles the New York–Connecticut state line, and part of the route is physically located in Connecticut. However, this part of the highway is not recognized by Connecticut as "Route 120A", and is considered to be part of NY 120A by the New York State Department of Transportation (NYSDOT).
New York State Route 123 (NY 123) is a 4.68-mile (7.53 km) north–south state highway in the northern part of Westchester County, New York, in the United States. The route, named Smith Ridge Road, is a northward continuation of Route 123 from New Canaan, Connecticut.
New York State Route 124 (NY 124) is a 4.96-mile (7.98 km) long north–south state highway in the northern part of Westchester County, New York, in the United States. NY 124 begins at NY 137 in the hamlet of Pound Ridge. It heads north and crosses into the town of Lewisboro, ending west of the hamlet of South Salem at NY 35. Just before the junction with NY 35, NY 124 splits into a west leg and an east leg, with both legs ending at NY 35. Both legs are signed as NY 124 but the main line officially runs on the west leg. The east leg is internally designated as NY 983D, an unsigned reference route. Both legs are approximately 0.35 miles (0.56 km) in length.
New York State Route 125 (NY 125) is a 7.50-mile (12.07 km) north–south state highway located within Westchester County, New York, in the United States. The route begins at an intersection with U.S. Route 1 (US 1) in the Town of Mamaroneck and ends at a junction with NY 22 in the city of White Plains. A section of the route in the city of White Plains is maintained by Westchester County and co-designated as County Route 26 (CR 26). A second county-owned segment exists along the New Rochelle–Scarsdale line as County Route 129. Both numbers are unsigned. NY 125 was assigned as part of the 1930 renumbering of state highways in New York, initially extending from US 1 to Mamaroneck Avenue in White Plains. It was extended north to NY 22 in the mid-1930s.
New York State Route 137 (NY 137) is a 5.51-mile (8.87 km) long state highway in Westchester County, New York, in the United States. The route is a continuation of Connecticut's Route 137, which links NY 137 to Stamford, Connecticut. NY 137 goes through the hamlet of Pound Ridge and ends at NY 121 north of the hamlet of Bedford, locally known as Bedford Village.
New York State Route 100C (NY 100C) is an east–west spur route of NY 100 located in Westchester County, New York, in the United States. The road is entirely within the town of Greenburgh, running for 1.24 miles (2.00 km) from an intersection with NY 9A to a junction with NY 100 and NY 100A just east of the Sprain Brook Parkway. The eastern terminus of NY 100C also serves as NY 100A's northern endpoint.
New York State Route 100B (NY 100B) is a 2.88-mile (4.63 km) spur route of NY 100 in Westchester County, New York, in the United States. The route follows Dobbs Ferry Road across the southern part of the town of Greenburgh, connecting NY 9A to NY 119. It does not directly connect to NY 100; however, it intersects NY 100A about 1 mile (1.6 km) west of NY 119. NY 100B was assigned in the late 1930s.
New York State Route 134 (NY 134) is a 6.35-mile (10.22 km) state highway in the western part of Westchester County, New York, in the United States. It begins at an intersection with NY 133 in the village of Ossining and heads northeast to the hamlet of Kitchawan, located adjacent to the New Croton Reservoir in the town of Yorktown. From here, the route turns southeast to reach its east end at a junction with NY 100. The highway passes the Thomas J. Watson Research Center, one of the main research headquarters for IBM, just east of an interchange with the Taconic State Parkway.
New York State Route 50 (NY 50) is a 31.67-mile (50.97 km) state highway in the Capital District of New York in the United States. The southern terminus of the route is at an intersection with NY 5 in Scotia. Its northern terminus is at a junction with NY 32 in the Saratoga County hamlet of Gansevoort.
The Central Westchester Parkway is a 1.01-mile (1.63 km) controlled-access parkway in Westchester County, New York, in the United States. It runs from exit 7 of the Cross Westchester Expressway (I-287) to New York State Route 22 (NY 22). The road has two intermediate exits and is maintained by Westchester County as County Route 150.
New York State Route 56 (NY 56) is a 51.44-mile-long (82.78 km) north–south state highway in eastern St. Lawrence County, New York, in the United States. The southern terminus of the route is at an intersection with NY 3 in the town of Colton. Its northern terminus is at a junction with NY 37 southwest of Massena in the town of Louisville. NY 56 follows the Raquette River for most of its length and serves the village of Potsdam, where it passes by the campus of State University of New York at Potsdam.