Editing Interstate 684

{{Short description|Interstate Highway in New York and Connecticut}}
{{Use mdy dates|date=September 2019}}
{{Use American English|date=August 2022}}
{{Infobox road
| country = USA
| route = 684
| type = I
| map = {{maplink-road|from2=I-684 Extensions.map}}
| map_custom = yes
| map_notes = I-684 highlighted in red, and extensions maintained as reference routes in blue
| maint = [[New York State Department of Transportation|NYSDOT]]
| length_mi = 28.53
| length_ref = <ref>{{cite web |last=Starks |first=Edward |date=January 27, 2022 |title=Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways |url=https://www.fhwa.dot.gov/planning/national_highway_system/interstate_highway_system/routefinder/table02.cfm |access-date=August 15, 2022 |work=FHWA Route Log and Finder List |publisher=[[Federal Highway Administration]]}}</ref>
| established = January 1, 1970<ref name="1970log" />
| history = First segment opened in October 1968, completed in December 1974
| spur_type = I
| spur_of = 84 in New York
| direction_a = South
| terminus_a = {{jct|state=NY|I|287|Parkway|Hutchinson River}} in [[Harrison, New York|Harrison]]
| junction = {{Plainlist|
*{{jct|state=NY|NY|22}} in [[Armonk, New York|Armonk]]
*{{jct|state=NY|Parkway|Saw Mill|NY|35}} in [[Katonah, New York|Katonah]]
}}
*{{jct|state=NY|I|84}} in [[Brewster, New York|Brewster]]
*{{jct|state=NY|US|6|US|202}} in [[Southeast, New York|Southeast]]
| direction_b = North
| terminus_b = {{jct|state=NY|NY|22}} in Southeast
| states = [[New York (state)|New York]], [[Connecticut]]
| counties = '''NY''': [[Westchester County, New York|Westchester]], [[Putnam County, New York|Putnam]]<br>'''CT''': [[Fairfield County, Connecticut|Fairfield]] (no jcts)
| browse = {{ny browse|previous_type=I|previous_route=678|previous_dab=|route=[[List of numbered highways in New York|NY]]|next_type=I|next_route=687|next_dab=}}{{ct browse|previous_type=I|previous_route=491|route=[[List of State Routes in Connecticut|CT]]|next_type=I|next_route=691}}
}}
'''Interstate&nbsp;684''' ('''I-684''') is a {{convert|28.53|mi|km|adj=mid}} [[auxiliary Interstate Highway]] in the state of [[New York (state)|New York]] in the United States. There is also a short portion in [[Connecticut]] with no junctions. The highway connects [[Interstate 84 in New York|I-84]] with [[Interstate 287|I-287]] and the [[Hutchinson River Parkway]], primarily serving commuter traffic to and from the northern suburbs of the [[New York metropolitan area]]. Most of the route is in northern [[Westchester County, New York|Westchester County]]. The route of the highway was originally designated as part of [[Interstate 87 (New York)|I-87]] from 1968 to 1970. The first section of the roadway opened to traffic in October 1968, and the final segment was completed in December 1974.

==Route description==

===Cross Westchester Expressway to Saw Mill River Parkway ===
Northward, I-684 begins as two separate spur routes. The primary spur, which is officially designated I-684, begins at the [[White Plains, New York|White Plains]]–[[Harrison, New York|Harrison]] line at exit&nbsp;9A of the [[Cross Westchester Expressway]] ([[Interstate 287|I-287]]) in [[Westchester County, New York]]. The other, officially designated as '''New York State Route&nbsp;984J''' ('''NY&nbsp;984J''') but signed as I-684 in the northbound direction, begins in Harrison north of exit&nbsp;16A (formerly exit&nbsp;26) on the [[Hutchinson River Parkway]]. NY&nbsp;984J has one independent exit with Manhattanville Road, which serves [[Manhattanville College]], before joining the spur to I-287. The spurs, I-287 and the Hutch, surround an [[office park]]. From the junction of the two spurs, the Interstate Highway takes a straight course to the north-northwest through a wooded corridor with Century Country Club on the west and residences on the east. After the Barnes Lane overpass a mile and a half ({{Convert|1.5|mi|km|disp=output only}}) north of the spurs, it veers to the north-northeast for a half-mile ({{Convert|0.5|mi|m|disp=output only}}) before turning to the north alongside Rye Lake, part of [[Kensico Reservoir]], one of many that [[New York City water supply system|provide water to New York City]]. It remains in an increasingly narrow strip of woods between the lake and [[Westchester County Airport]] into its first exit, Airport Road, {{Convert|4.4|mi|km}} from its southern terminus. [[New York State Route 120|NY&nbsp;120]] parallels the highway to the east.

[[File:CT state line signs on I-684.jpg|upright|thumb|left|Signs at Connecticut state line]]

Just north of that exit, NY&nbsp;120 crosses over the road. Immediately after this exit, I-684 crosses the Connecticut state line. Signage indicates this, but it retains its New York [[reference marker]]s as it curves more to the northeast for the next {{convert|1.41|mi}} through wooded and swampy country in the western corner of [[Greenwich, Connecticut|Greenwich]]. There is no exit in Connecticut. {{One2a|{{convert|1|mi|km|spell=In}}}} after it reenters New York, in the town of [[North Castle, New York|North Castle]], it reaches its next exit, where [[New York State Route 22|NY&nbsp;22]] serves that community and the nearby hamlet of [[Armonk, New York|Armonk]]. The short section of I-684 in Connecticut is owned by the [[Connecticut Department of Transportation]] (CTDOT), but maintenance and repairs to the stretch are performed by the [[New York State Department of Transportation]] (NYSDOT), with the cost of maintenance being reimbursed to New York by Connecticut.

Past that exit, it bends even more to the northeast, continuing past houses, parks, and golf courses located amidst dense woodlands. At Byram Lake Reservoir, it returns to a northward heading for {{One2a|{{convert|1|mi|km|spell=in}}}}, crossing into the town of [[Bedford (town), New York|Bedford]]. The highway then curves northeasterly and then to the northwest once the reservoir is past. The Arthur W. Butler Memorial Sanctuary, a private nature preserve, replaces it on the east of the highway. Just south of the exit for [[New York State Route 172|NY&nbsp;172]], I-684 bends northwest again.

Over the next {{Convert|2|mi|km|spell=in}}, the Interstate curves gently back and forth, maintaining its generally northerly heading, as its [[median strip]] widens slightly. The surrounding lands start to include some more cleared lots, larger estates that were once small farms. At the northern end of this section, a [[rest area]] serves southbound traffic. The highway passes [[Bedford Hills Correctional Facility for Women]], one of New York's two main women's prisons, a short distance to its west, and then bends northwest into the most extensive junction since its beginning: the northern terminus of the [[Saw Mill River Parkway]].

=== Saw Mill River Parkway to Brewster ===
[[File:Bedford NY 684 Saw Mill 22 35 117.svg|thumb|Diagram of Interchanges&nbsp;5 and 6]]
The Saw Mill merges from the southeast, its two roadways forming [[service road]]s flanking I-684 for the next mile ({{Convert|1|mi|km|disp=output only}}) as it passes a southern extension of [[Muscoot Reservoir]] just east of the hamlet of [[Katonah, New York|Katonah]]. Entry from the Interstate to the parkway (and [[New York State Route 117|NY&nbsp;117]], which has its northern terminus at the parkway just below the Interstate) is from the southbound lanes only. A half-mile ({{Convert|0.5|mi|m|disp=output only}}) north of the merger, the frontage roads merge into the Interstate at the exit for [[New York State Route 35|NY&nbsp;35]], serving Katonah and the hamlet of [[Cross River, New York|Cross River]] to the east. After that exit, the electrified tracks of [[Metro-North Railroad]]'s [[Harlem Line]] parallel the highway to the west. They cross into the town of [[Lewisboro, New York|Lewisboro]]. {{One2a|{{convert|1|mi|km|spell=In}}}} north of that point, NY&nbsp;22 parallels on the east. A northbound-only exit leads onto it, allowing access to [[New York State Route 138|NY&nbsp;138]], which crosses the Interstate at the hamlet of [[Goldens Bridge, New York|Goldens Bridge]]. [[Goldens Bridge station|Its train station]] is prominently visible on the west side of the highway.

North of that station is the [[North Salem, New York|North Salem]] town line. NY&nbsp;22 detours slightly eastward, away from the interstate, for {{One2a|{{convert|1|mi|km|spell=in}}}}. When it returns, the roads and the railroad tracks bend strongly to the northeast, following the [[Croton River]] on their west. After {{One2a|{{convert|1|mi|km|spell=in}}}}, this brings them to I-684's next exit, at [[New York State Route 116|NY&nbsp;116]], again for only northbound traffic but with southbound entry. [[Purdy's station]] is also adjacent to the highway but is screened from view by a line of trees. A quarter-mile ({{Convert|0.25|mi|m|disp=output only}}) to the north, NY&nbsp;22 crosses under to the opposite side. A short distance later, the Harlem Line veers northwest, followed quickly by NY&nbsp;22, as the Interstate veers northeast. The Hardscrabble Road exit serves both directions and, via NY&nbsp;22, allows access to the nearby hamlet of Croton Falls. {{Convert|1|mi|km|spell=In}} past that junction, I-684 crosses into [[Putnam County, New York|Putnam County]] and the town of [[Southeast, New York|Southeast]].

Within a thousand feet ({{Convert|1000|ft|m|disp=output only}}) of the county line, the [[Brewster, New York|Brewster]] rest area serves northbound traffic. Beyond, the highway turns slightly more to the east, then swings back to the north into its northern terminus at [[Interstate 84 in New York|I-84]]. An almost-complete [[cloverleaf interchange]] guides traffic east to [[Danbury, Connecticut]], or west toward [[Newburgh, New York|Newburgh]]. Traffic continuing north remains on a controlled-access route, designated but [[unsigned highway|not signed]] as NY&nbsp;981B, to the last signed exit with the [[concurrency (road)|concurrent]] routes of [[U.S. Route 6 in New York|US Route&nbsp;6]] (US&nbsp;6) and [[U.S. Route 202 in New York|US&nbsp;202]] adjacent to [[East Branch Reservoir]]. The highway carrying both roads parallels I-84 at this point. Just past it, I-684 officially ends as NY&nbsp;22 merges onto the freeway, having left the US&nbsp;6/US&nbsp;202 concurrency. NY 22 briefly continues north as a four-lane freeway before becoming a two-lane surface road by the at-grade intersection with Sodom and Old Milltown Roads.<ref>{{Google maps |url=https://maps.google.com/maps?f=q&hl=en&q=brewster,+ny&ie=UTF8&z=14&ll=41.389109,-73.598871&spn=0.032261,0.086002&om=1 |access-date=June 8, 2009}}</ref>

==History==
[[File:Aerial - Muscoot Reservoir & Cross River Reservoir, NY 01 - white balanced (9614400358).jpg|thumb|left|I-684 wends between [[Muscoot Reservoir]] (top left) to its west and [[Cross River Reservoir]] to its east near [[Katonah, New York]]. Byram Lake Reservoir just west of I-684 at bottom. (Aerial photo, 2013).]]

An expressway along the NY&nbsp;22 corridor between White Plains and Brewster was planned by Westchester County in 1956. In 1961, the proposed routing of I-87 north of Elmsford along the east bank of the Hudson River was relocated to use the NY&nbsp;22 corridor instead via modern I-287 and I-84. After much controversy, the proposed routing of I-87 was approved by the [[Bureau of Public Roads]] in December 1964. Construction began soon after the approval with the southernmost section between White Plains and Armonk (including the short section in Connecticut) opened in October 1968. The northernmost section between Purdy's and Brewster opened in 1969.

On January 1, 1970, the designation I-87 was relocated to follow the [[New York State Thruway]] north of Elmsford. The old route was redesignated as I-684.<ref name="1970log">{{cite book |url=http://www.greaternyroads.info/pdfs/state70.pdf |title=Official Description of Touring Routes in New York State |date=January 1, 1970 |author=State of New York Department of Transportation |author-link=State of New York Department of Transportation |format=PDF |access-date=June 3, 2009}}</ref> Later that year, a third segment of the new highway between Armonk and Bedford Hills opened to traffic as well. For a time, Route&nbsp;22 was a four-lane superhighway extending from Bedford Hills/Katonah to Goldens Bridge. The final segment eventually utilized the footprint of Route&nbsp;22 and the Route&nbsp;22 designation was returned to "Old Route&nbsp;22", its original parallel path.  The portion from Goldens Bridge to Brewster, which required rock cuts, proved to be difficult from an engineering standpoint, was completed in December 1974. 
{{-}}

==Exit list==
===I-684===
I-684's exit numbers are [[Sequential exit numbering|sequential]]. While NYSDOT is transitioning to [[Mileage-based exit numbering|mileage-based numbers]], there are no announced plans to convert I-684 exit numbers.
{{jcttop|state_col=state|exit|length_ref=<br><ref name=2019tvr>{{cite web |url=https://www.dot.ny.gov/divisions/engineering/technical-services/hds-respository/NYSDOT_2019TrafficVolumeReport-Routes.pdf |title=2019 Traffic Volume Report - Routes |date=July 30, 2020 |publisher=[[New York State Department of Transportation]] |access-date=July 20, 2022}}</ref><ref name=westchester-inventory>{{cite web |url=https://www.dot.ny.gov/divisions/engineering/technical-services/hds-respository/HighwayInventory-WestchesterCounty-2016.zip |title=Westchester County Inventory Listing |date=August 7, 2015 |publisher=New York State Department of Transportation |format=CSV |access-date=July 20, 2022 }}</ref><ref name=putnam-inventory>{{cite web |url=https://www.dot.ny.gov/divisions/engineering/technical-services/hds-respository/HighwayInventory-PutnamCounty-2016.zip |title=Putnam County Inventory Listing |date=August 7, 2015 |publisher=New York State Department of Transportation |format=CSV |access-date=July 20, 2022 }}</ref>}}
{{NYint|exit
|sspan=3
|county=Westchester
|cspan=3
|location1=White Plains
|location2=Harrison
|mile=0.00
|mspan=2
|exit=—
|road={{jct|state=NY|I|287|city1=White Plains|city2=Rye|road|Westchester Avenue}}
|notes=Southern terminus; exit 9A on I-287, exit 16A on the Hutchinson River Parkway
|nspan=2
}}
{{NYint|exit
|location=Harrison
|mile=none
|exit=1
|road={{jct|state=NY|Parkway|Hutchinson River|dir1=south|city1=New York City}}
|notes=none
}}
{{NYint|exit
|location=North Castle
|mile=4.18
|exit=2
|road={{jct|state=NY|extra=airport|NY|120|location1=[[Westchester County Airport]]}}
|notes=Access via Airport Road; also serves [[SUNY Purchase]]
}}
{{jctco|state=CT|sspan=1|county=Fairfield}}
{{NYint|exit
|sspan=12
|mile=7.63
|exit=3
|county=Westchester
|cspan=8
|location=North Castle
|road={{jct|state=NY|NY|22|city1=Bedford|areadab1=CDP|city2=Armonk}}
|notes=Signed as exits 3N (north) and 3S (south) northbound
}}
{{NYint|exit
|location=Bedford
|lspan=4
|area=town
|mile=12.72
|exit=4
|road={{jct|state=NY|NY|172|city1=Bedford|areadab1=CDP|city2=Mount Kisco}}
}}
{{NYint|exit
|mile=14.86
|place=Bedford Rest Area (southbound)
}}
{{NYint|exit
|mile=16.94
|type=incomplete
|exit=5
|road={{jct|state=NY|dir1=south|Parkway|Saw Mill|to2=yes|NY|117|dir2=south|location1=[[New York City]]}}
|notes=Southbound exit and northbound entrance; northern terminus of Saw Mill Parkway
}}
{{NYint|exit
|mile=17.55
|exit=6
|road={{jct|state=NY|NY|35|city1=Cross River|city2=Katonah}}
|notes=Also serves [[Katonah station]]
}}
{{NYint|exit
|location=Lewisboro
|mile=19.00
|type=incomplete
|exit=6A
|road={{jct|state=NY|NY|22|NY|138|to2=yes|city1=Goldens Bridge}}
|notes=Northbound exit only; also serves [[Goldens Bridge station]]
}}
{{NYint|exit
|location=North Salem
|lspan=2
|mile=22.48
|type=incomplete
|exit=7
|road={{jct|state=NY|NY|116|to2=yes|NY|22|city1=Purdys|city2=Somers}}
|notes=Northbound exit and southbound entrance; also serves [[Purdy's station]]
}}
{{NYint|exit
|mile=23.93
|exit=8
|road=Hardscrabble Road&nbsp;– [[Croton Falls, New York|Croton Falls]]
|notes=Also serves [[Croton Falls station]]
}}
{{NYint|exit
|county=Putnam
|cspan=4
|location=Brewster
|lspan=3
|mile=25.30<!--countyline=24.96-->
|place=Brewster Rest Area (northbound)
}}
{{NYint|exit
|mile=28.21<!--+3.25-->
|exit=9
|road={{jct|state=NY|I|84|location1=[[Danbury, Connecticut|Danbury]]|city2=Newburgh}}
|notes=Signed as exits 9E (east) and 9W (west); exit 68 on I-84
}}
{{NYint|exit
|mile=28.47<!--+3.51-->
|exit=10
|road={{jct|state=NY|US|6|US|202|NY|22|dir3=south|city1=Brewster}}
|notes=
}}
{{NYint|exit
|location=Southeast
|mile=28.53<!--+3.59-->
|exit=—
|road={{jct|state=NY|NY|22|dir1=north|city1=Pawling|areadab1=village}}
|notes=Northern terminus
}}
{{jctbtm|col=8|keys=incomplete}}

===NY 984J===
{{NYinttop|county=Westchester|location=Harrison|unnum=yes|length_ref=<br><ref name=2019tvr>{{cite web |url=https://www.dot.ny.gov/divisions/engineering/technical-services/hds-respository/NYSDOT_2019TrafficVolumeReport-Routes.pdf |title=2019 Traffic Volume Report - Routes |date=July 30, 2020 |publisher=[[New York State Department of Transportation]] |access-date=July 20, 2022}}</ref><ref>{{Google maps|url=https://www.google.com/maps/dir/41.0185049,-73.7152382/41.0229455,-73.7183524/@41.0206906,-73.7211461,1183m/data=!3m1!1e3!4m2!4m1!3e0|title=Distance from 984J southern terminus to Manhattanville Road jct|access-date=July 20, 2022}}</ref>}}
{{NYint
|mile=0.00
|road={{jct|state=NY|Parkway|Hutchinson River|dir1=south|city1=New York City}}
|notes=Southern terminus; exit 16A on Hutchinson Parkway
}}
{{NYint
|mile=0.40
|road=Manhattanville Road
|notes=All trucks must exit southbound
}}
{{NYint
|mile=1.53
|road={{jct|state=NY|I|684|dir1=north|city1=Brewster|nolink1=y}}
|notes=Northern terminus; exit 1 on I-684
}}
{{jctbtm}}

==See also==
*{{Portal-inline|U.S. roads}}
*{{Portal-inline|New York (state)}}

==References==
{{Reflist}}

==External links==
{{Commons category|Interstate 684}}
{{Attached KML}}
{{NYSR external links|type=I|nyroutes=yes|route=684|alps=yes|unyrds=yes}}
*[http://www.nycroads.com/roads/I-684_NY/ Information about I-684 at nycroads.com]
*[https://www.nytimes.com/2003/11/23/nyregion/a-road-mystery-clue-think-detour.html article by Charles Delafuente about I-684 in Connecticut]

{{I-84 (east) aux}}

[[Category:Auxiliary Interstate Highways|84-6]]
[[Category:Interstate Highways in New York (state)|84-6]]
[[Category:Interstate Highways in Connecticut|84-6]]
[[Category:Transportation in Westchester County, New York]]
[[Category:Transportation in Putnam County, New York]]
[[Category:Interstate 84 (Pennsylvania–Massachusetts)|6]]
[[Category:Transportation in Fairfield County, Connecticut]]