New York State Route 100 (NY 100) is a major north–south state highway in

Westchester County, New York Westchester County is located in the U.S. state of New York. It is the seventh most populous county in the State of New York and the most populous north of New York City. According to the 2020 United States Census, the county had a population ...

, in the United States. It begins parallel to Interstate 87 (I-87) at a junction with the

Cross County Parkway The Cross County Parkway (CCP) is a parkway in lower Westchester County, New York, in the United States. The parkway is a critical east–west connection throughout Westchester, having full interchanges with every major north–south high ...

in the city of

Yonkers Yonkers () is a city in Westchester County, New York, United States. Developed along the Hudson River, it is the third most populous city in the state of New York (state), New York, after New York City and Buffalo, New York, Buffalo. The popul ...

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.

Route description

NY 100 begins in the city of

as Central Park Avenue (almost always just called "Central Avenue") at exit 4 of the New York State Thruway (

I-87 Interstate 87 may refer to either of two unconnected Interstate Highways in the United States: * Interstate 87 (New York), a highway running from New York City north to the Canadian border in Champlain, New York. * Interstate 87 (North Carolina) ...

). This portion of Central Avenue is maintained by Westchester County as County Route 47II (CR 47II), an unsigned reference route. Central Avenue continues south as a service road for I-87 until

The Bronx The Bronx () is a borough of New York City, coextensive with Bronx County, in the state of New York. It is south of Westchester County; north and east of the New York City borough of Manhattan, across the Harlem River; and north of the New Y ...

, where it splits from I-87 shortly after entering the city, and becomes Jerome Avenue, a major surface road in the West Bronx. NY 100 diverges from I-87 just north of exit 5 and heads northeast, crossing over the

Sprain Brook Parkway The Sprain Brook Parkway (also known as The Sprain) is a long north–south parkway in Westchester County, New York, United States. It begins at an interchange with the Bronx River Parkway in the city of Yonkers, and ends at the former site ...

about beyond the split. Central Avenue has an interchange with Tuckahoe Road shortly after the

. The road continues through Yonkers in the area between the

Grassy Sprain Reservoir The Grassy Sprain Reservoir is a storage reservoir in northern Yonkers, New York. It was completed in 1876 by the City of Yonkers as the city's main storage reservoir. The reservoir was formed by the Grassy Sprain Brook Dam which impounded the Sp ...

and the

Bronx River The Bronx River (), approximately long, flows through southeast New York in the United States and drains an area of . It is named after colonial settler Jonas Bronck. Besides the Hutchinson River, the Bronx River is the only fresh water river in ...

, with many shops lining both sides. At the northernmost part of the city, Central Avenue intersects Fort Hill Road, which leads to Jackson Avenue and the northbound

. Central Avenue continues out of the city of Yonkers into the Edgemont/Greenville section of the town of Greenburgh. The only noteworthy intersection in this area is with Ardsley Road, and east-west road that goes straight across most of south-central Westchester. NY 100 runs through the hamlet of

Hartsdale Hartsdale is a hamlet located in the town of Greenburgh, Westchester County, New York, United States. The population was 5,293 at the 2010 census. It is a suburb of New York City. History Hartsdale, a CDP/hamlet/post-office in the town of Green ...

, about two miles (3 km) north of the city line, and where the bypass route NY 100A (Hartsdale Avenue) begins. Hartsdale Avenue also continues east of the intersection into the village of Hartsdale without a route designation. Central Avenue then enters the city limits of White Plains, where the road ends at

NY 119 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 junctio ...

(Tarrytown Road). Within White Plains, the road is county-maintained with unsigned designations of CR 99 and CR 90. NY 100 north follows NY 119 west for a overlap through the western reaches of White Plains. Access to I-287 (the Cross-Westchester Expressway) and the Bronx River Parkway can be made in the vicinity of the 100/119 overlap. NY 100 then splits off to the north using Hillside Avenue and Grasslands Road as it goes around the perimeter of

Westchester Community College Westchester Community College (WCC) is a public community college in Valhalla, New York, in Westchester County. It is part of the State University of New York (SUNY) system. History New York Institute of Applied Arts and Sciences becomes Westc ...

. At a four-way intersection between Grasslands Road, Knollwood Road, and Bradhurst Avenue, NY 100 meets with the north end of NY 100A (Knollwood Road) and the east end of NY 100C. NY 100 makes a right-hand turn to follow Bradhurst Avenue north from the junction while Grasslands Road continues west as NY 100C. Bradhurst Avenue leads into the hamlet of Hawthorne within the town of Mount Pleasant, crossing over the

along the way. NY 100 subsequently shifts onto Briarcliff-Peekskill Parkway ( NY 9A), a continuation of the Saw Mill River Road, after using a brief section of NY 141 (Broadway). From this junction, the parkway (carrying 9A and 100) is a limited access highway (or "freeway") as it continues north alongside the

Taconic State Parkway The Taconic State Parkway (often called the Taconic or the TSP and known administratively as New York State Route 987G or NY 987G) is a parkway between Kensico Dam and Chatham, the longest in the U.S. state of New York. It follows ...

. It has an interchange with NY 117 (Bedford Road) about north of the 9A/100 merge, with all exits and entrances on the left. 9A and 100 then enter the eastern edge of the village of

Briarcliff Manor Briarcliff Manor () is a suburban village in Westchester County, New York, north of New York City. It is on of land on the east bank of the Hudson River, geographically shared by the towns of Mount Pleasant and Ossining. Briarcliff Manor inc ...

NY 100 then branches off on its own again in Briarcliff Manor, with NY 9A continuing north along the Briarcliff–Peekskill Parkway and NY 100 continuing northeast on the Saw Mill River Road, which roughly follows New York Central's old Putnam Division railroad. Many of the railroad's old stations can still be found along the highway. NY 100 passes through New Castle and meets NY 133 in the hamlet of Millwood, where access to the

can also be made. From here, NY 100 then follows the path of the Croton Turnpike (alternatively known in the area as Somerstown Turnpike and also as Saw Mill River Road). The road continues into the town of Yorktown, passing by the hamlet of Kitchawan. NY 100 then crosses the Croton Reservoir on Pines Bridge. After crossing the reservoir, NY 118 splits off to the west on Saw Mill River Road, while NY 100 continues northeast on the Croton Turnpike. Elephant Hotel 2007

The Croton Turnpike continues into the town of Somers, passing by some of the last remaining rural areas in Westchester County, including Muscoot Farm, a county owned early-1900s interpretive farm. North of the farm NY 100 intersects with NY 35 in the hamlet of Whitehall Corners, site of a PepsiCo complex. In its northern extremes, NY 100 roughly parallels the Croton Reservoir on the north side before meeting up with US 202 in the hamlet of Somers, where it ends opposite the Elephant Hotel.

History

Early roads

The southernmost section of NY 100, known as "Central Avenue", appeared in maps by 1888. It was constructed as a plank road in 1874 connecting Macombs Dam Bridge (then known as Central Bridge) to Westchester County. The road continues south into the

Bronx The Bronx () is a borough of New York City, coextensive with Bronx County, in the state of New York. It is south of Westchester County; north and east of the New York City borough of Manhattan, across the Harlem River; and north of the New Y ...

Jerome Avenue Jerome Avenue is one of the longest thoroughfares in the New York City borough of the Bronx, New York, United States. The road is long and stretches from Concourse to Woodlawn. Both of these termini are with the Major Deegan Expressway which r ...

, which was originally also called Central Avenue. The middle section of NY 100 uses the southernmost segment of the Briarcliff-Peekskill Parkway, which is a continuation of the Saw Mill River Road, between Hawthorne and

, sharing it with NY 9A. The Saw Mill River Road splits from the parkway along with NY-100, and NY-100 uses the Saw Mill River Road until it splits from NY-100 in the Town of Yorktown to follow NY-118. The Saw Mill River Road is an early colonial road connecting many different hamlets and villages in Westchester County. It follows along the path of various rivers and brooks, the most notable of which being the road's namesake, the Saw Mill River, as it winds its way to the north of the county. The road is now used as parts of several state routes, including NY 9A, NY 100, and NY 118. The segment used by NY-100 mostly follows the Pocantico River. The northernmost section of NY 100 runs along a part of the "Croton Turnpike", an early private toll road that was chartered in 1807. The Croton Turnpike connects the village of Ossining (then called Sing Sing) to the hamlet of Somers via Kitchawan. The road was made free in 1849. The Saw Mill River Road was rerouted to overlap the Croton Turnpike as it navigates around and across the Croton Reservoir, which was constructed between 1837 and 1842. In 1908, the

New York State Legislature The New York State Legislature consists of the two houses that act as the state legislature of the U.S. state of New York: The New York State Senate and the New York State Assembly. The Constitution of New York does not designate an officia ...

created Route 2, an unsigned

legislative route In the United States, a legislative route (LR) or legislative highway is a highway defined by laws passed in a state legislature. The numbering of such highways may or may not correspond to the numbers familiar to the public as part of the state, ...

extending from the

New York City New York, often called New York City or NYC, is the most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the most densely populated major city in the Un ...

line at

to the Columbia County village of Valatie. Route 2 followed Central Avenue (now NY 100) north through Yonkers to

, where it veered west to bypass White Plains on modern NY 100A, NY 100B, and

. It rejoined what is now NY 100 at the junction of Tarrytown Road (NY 119) and Hillside Avenue and followed it north along Hillside Avenue and Grasslands Road to the modern junction of NY 100, NY 100A, and NY 100C, at which point Route 2 continued west toward the

Hudson River The Hudson River is a river that flows from north to south primarily through eastern New York. It originates in the Adirondack Mountains of Upstate New York and flows southward through the Hudson Valley to the New York Harbor between N ...

on current NY 100C.

Designation

NY 100 was first designated in the 1930 renumbering of state highways in New York, when many of the state roads in Westchester County were first publicly posted with route numbers. Originally, it went north from the Croton Reservoir to US 6 (now NY 6N) in Mahopac Falls on what is now NY 118, Baldwin Place Road, and Myrtle Avenue. Also assigned at this time was NY 118, which began adjacent to the Croton Reservoir at NY 100 and proceeded northeast along the Croton Turnpike to

NY 22 New York State Route 22 (NY 22) is a north–south state highway that parallels the eastern border of the U.S. state of New York, from the outskirts of New York City to the hamlet of Mooers (CDP), New York, Mooers in Clinton County, ...

in Croton Falls via modern NY 100 and US 202. The alignments of NY 100 and NY 118 north of the Croton Reservoir were swapped , placing NY 118 on the more westerly alignment and NY 100 on the Croton Turnpike between the reservoir and Croton Falls. In December 1934, at the insistence of the Automobile Club of New York, several numbered routes were extended and signed within

, with NY 100 being one of these routes. NY 100 was extended south from the Yonkers line in the Bronx along

to the Grand Concourse. NY 100 crossed into Manhattan via East 149th Street and the

145th Street Bridge The 145th Street Bridge is a four-lane swing bridge across the Harlem River in New York City, connecting 145th Street and Lenox Avenue in Manhattan with 149th Street and River Avenue in the Bronx. The bridge is operated and maintained by the N ...

. In Manhattan, NY 100 continued south along

Lenox Avenue Lenox Avenue – also named Malcolm X Boulevard; both names are officially recognized – is the primary north–south route through Harlem in the upper portion of the New York City borough of Manhattan. This two-way street runs from F ...

, 110th Street, Fifth Avenue, 96th Street, and

Park Avenue Park Avenue is a wide New York City boulevard which carries north and southbound traffic in the boroughs of Manhattan and the Bronx. For most of the road's length in Manhattan, it runs parallel to Madison Avenue to the west and Lexington Av ...

, ending at

Houston Street Houston Street ( ) is a major east–west thoroughfare in Lower Manhattan in New York City. It runs the full width of the island of Manhattan, from FDR Drive along the East River in the east to the West Side Highway along the Hudson River i ...

( NY 1A). South of

Fordham Road Fordham Road is a major thoroughfare in the Bronx, New York City, that runs west-east from the Harlem River to Bronx Park. Fordham Road houses the borough's largest and most diverse shopping district. It geographically separates the North Bro ...

, NY 100 was overlapped with

all the way to Houston Street. The NY 100 designation was removed from

following the opening of the Major Deegan Expressway in 1956. In 1934, US 202 was designated and overlapped with NY 118 (later NY 100) from Somers to Croton Falls. The overlap between NY 100 and US 202 lasted as late as 1990. NY 100 was cut back to end at US 202 in Somers by 2004. The south end of NY 100 had been at the New York City line since 1956; however, as of 2007,

NYSDOT The New York State Department of Transportation (NYSDOT) is the department of the New York state government responsible for the development and operation of highways, railroads, mass transit systems, ports, waterways and aviation facilities in ...

recognizes the

underpass as the official southern terminus of NY 100.

Expressway plans

In April 1956, the Westchester County Planning Commission recommended that a new expressway should be built along the current NY 100 north of White Plains. The road was to be an extension of the Central Corridor Expressway, which was proposed as NY 125. This extension was stretch to Putnam County. The area was a high-priority corridor, stretching from the Cross-Westchester Expressway (I-287) to the proposed Northern Westchester Expressway (NY 35). North of NY 35, the area was a medium-priority corridor, ending at US 6 in Mahopac. This plan never materialized and

Interstate 684 Interstate 684 (I-684) is a north–south auxiliary Interstate Highway in the state of New York in the United States. There is also a short portion in Connecticut with no junctions. The highway connects I-84 with I-287 and the Hutchinson ...

along the NY 22 corridor was built instead.

Suffixed routes

* NY 100A () is a bypass route of NY 100 that lets motorists avoid the frequently congested stretch of NY-100 in White Plains. NY 100A connects to

Interstate 287 Interstate 287 (I-287) is an auxiliary Interstate Highway in the US states of New Jersey and New York. It is a partial beltway around New York City, serving the northern half of New Jersey and the counties of Rockland and Westchester in ...

and goes near the NY 100B entrance to the

. It was assigned as part of the 1930 renumbering of state highways in New York. * NY 100B () is a spur off

. Although the route does not intersect NY 100, it meets NY 100A and terminates at NY 119 roughly from where NY 119 meets NY 100 and I-287. It connects to the

. The route was assigned in the late 1930s. * NY 100C () is a spur off NY 100 in Eastview. It connects to the Saw Mill Parkway at its western terminus and the

near its intersection with NY 100 and NY 100A. It was assigned in the late 1930s.

Major intersections

References

External links

{{NYSR external links, type=N, nyroutes=yes, termini=yes, route=100, alps=yes

100 100 or one hundred ( Roman numeral: C) is the natural number following 99 and preceding 101. In medieval contexts, it may be described as the short hundred or five score in order to differentiate the English and Germanic use of "hundred" to de ...

Transportation in Westchester County, New York Transportation in Yonkers, New York