Interstate 684 New York / Connecticut

Overview

Interstate 684 is a suburban freeway stretching 28 miles north from I-287 at White Plains to I-84 and NY 22 in the town of Southeast. The south end of the route partitions with separate branches to the Cross Westchester Expressway (I-287) and Hutchinson River Parkway. The New York State Department of Transportation (NYSDOT) inventories the connection with I-287 as Route I684 and the link with Hutchinson River Parkway as Route 984J.

I-684 parallels NY 120 north from Harrison between Rye Lake and Westchester County Airport (HPN) into the western panhandle of Connecticut. While there are no ingress or eggress points through the Constitution State, the Connecticut Department of Transportation (ConnDOT) maintains part of the roadway.¹

Northward into Armonk, New York, I-684 and NY 22 cross paths at the first of three meetings. NY 22 shifts east from the freeway through the town of North Castle while Interstate 684 parallels the Byram River north to Byram Lake Reservoir. Traversing hilly terrain through the town of Bedford, I-684 converges with the north end of Saw Mill River Parkway at the community of Katonah.

Entering the town of Lewisboro, I-684 and NY 22 run along side each other east of Muscoot Reservoir to Goldens Bridge. The two again parallel each other directly east of the Croton River at Purdys Station in North Salem. NY 22 combines with U.S. 202 west of I-684 as both highways turn northeast across the Putnam County line to Interstate 84 at Brewster.

History

The corridor for I-684 was originally apart of Interstate 87 extending north from the Cross Westchester Expressway to I-84 at Brewster. This alignment included a concurrency along Interstate 84 west across the Newburgh-Beacon Bridge over the Hudson River to the New York Thruway at the town of Newburgh.

The 1968 Highway Act redefined I-87 along the New York Thruway mainline from the Tappan Zee Bridge north to Interstate 84. Interstate 684 was established in 1969 with Federal Highway Administration (FHWA) approval on September 11 and American Association of State Highway and Transportation Officials (AASHTO) approval on October 26.

1969 map showing Interstate 684 as I-87 from I-287 at White Plains to NY 22 / Exit 3 in the town of New Castle.

Route Information

North End – Brewster, NY
South End – Purchase, NY
Total Mileage – 28.47

Mileage

New York – 27.06

Cities – White Plains
Junctions –

Connecticut – 1.41

Cities – none
Junctions – none

Source: December 31, 2021 Interstate Route Log and Finders List

I-684 Annual Average Daily Traffic (AADT)

Source: 2016 NYSDOT Traffic Data Viewer, NYSDOT 2002 Traffic Volume Report
State of Connecticut Department of Transportation 2015 Traffic Volumes State Maintained Highway Network (Traffic Log)

North End – Brewster, New York

North at

Interstate 684 winds northeast across a valley between Turk Hill and Starr Ridge on the two miles leading to Exit 9 with I-84. 08/19/21

Turk Hill Road spans I-684 beyond milepost 27, one mile south of the directional cloverleaf interchange (Exit 9) with Interstate 84. 08/19/21

A lane drop occurs at Exit 9E for Interstate 84 east for Danbury, Waterbury and Hartford, Connecticut. 08/19/21

Exit 9E leaves I-684 northbound for I-84 east into Connecticut. 08/19/21

Exit 9 W loops onto I-84 west to Newburgh and Scranton, Pennsylvania. The ensuing ramp links I-684 with U.S. 6-202 to NY 22 south along Main Street in the village of Brewster. 06/13/05

A folded diamond interchange (Exit 10) joins the north end of Interstate 684 with U.S. 6-202 and NY 22 along the west side of East Branch Reservoir. U.S. 6/202 parallel I-84 east into Danbury. Westward the two highways separate at Brewser, with U.S. 6 continuing through the village center to the town of Carmel. 05/31/22

NY 22 extends north from the freeway to the town of Patterson, the village of Pawling and NY 343 at the community of Wassaic. 05/31/22

An end Interstate 684 shield stands within the exchange at Exit 10. 05/31/22

South at

NY 22 south expands into a four lane expressway just ahead of the Croton River and I-684. 05/31/22

NY 22 transitions into Interstate 684 south at the forthcoming exchange with U.S. 6/202. 05/31/22

Interstate 684 begins as NY 22 departs at Exit 10 for U.S. 6/202 west into the village of Brewster. NY 22 overlaps with U.S. 202 southwest 4.9 miles to Croton Falls. 05/31/22

The first confirming marker for Interstate 684 stands a half mile north of Exit 9 / I-84. 05/31/22

An auxiliary lane opens along I-684 south over the bridge spanning U.S. 6/202 (Danbury Road) and the Housatonic Railroad line to Exit 9 W for Interstate 84 west. 05/31/22

Interstate 84 travels northwest from Brewster to the town of East Fishkill and west from there to the Newburgh-Beacon Bridge spanning the Hudson River. 05/31/22

I-84 arcs southeast between East Branch Reservoir and Cedar Swamp to the south of Joes Hill into Fairfield County, Connecticut. 05/31/22

Interstate 84 combines with U.S. 7 north ahead of the Danbury city center, seven miles east of Exit 9 E. 05/31/22

West at

I-84 continues 0.75 miles west from the half diamond interchange (Exit 69) with NY 121 (Peach Lake Road) to Interstate 684. 05/31/22

Starr Ridge Road crosses over I-84 westbound just ahead of the directional cloverleaf interchange (Exit 68) with Interstate 684. 05/31/22

Traffic to both I-684 south to White Plains and NY 22 north to Pawling and Brewster departs in unison from Interstate 84 westbound at Exit 68. 05/31/22

I-684 extends south directly to Hutchinson River Parkway at Harrison. The parkway travels southwest to the Bruckner Interchange joining I-95, I-278, I-295 and I-678 in the Bronx in New York City. 05/31/22

North End Throwback

East at

Original button copy sign for the interchange connecting Interstate 84 east with I-684 near Brewster. Photo by Michael Summa (1970).

Interstate 84 travels southward between the village of Brewster and Lake Tonetta to the directional cloverleaf interchange (Exit 68 / old Exits 20 S/N) with I-684. 06/13/05

One mile west of I-684 on Interstate 84 east. I-84 opened to traffic at Brewster in 1970. Photo by Michael Summa (1970).

Starr Ridge and Scott Ridge rise along the southern horizon as Interstate 84 lowers 180 feet in elevation toward Exit 68 A for I-684 south to Westchester County and White Plains. 06/13/05

A 1,246 foot long viaduct built in 1970 carries eastbound I-84 over the Croton River East Branch, U.S. 6/202-NY 22, Argonee Road and the Housatonic Railroad ahead of Interstate 684.<sup>2</sup> 06/13/05

Sign changes made for Exit 20 S by 2008 added New York City for Interstate 684 south and removed U.S. 6/202 and Brewster for Exit 20 N and NY 22 north. 06/13/05

Eastbound Interstate 84 at Exit 22 N for I-684 north to U.S. 6/202 (Danbury Road) and NY 22. This overhead assembly was removed by 2008. 06/13/05

West at

I-84 west at Interstate 684 south to White Plains and north to NY 22 not long after the completion of the freeway. Photo by Michael Summa (1970).

North at

Concrete roadways along Interstate 684, one mile south of I-84 by the Turk Hill Road overpass. 06/13/05

Sign bridges for Exit 9 and U.S. 6/202 and NY 22 south (Exit 10) were replaced during a resurfacing project along Interstate 684 north to I-84 in Summer/Fall 2018. 06/13/05

The button copy sign for Danbury was replaced by 2016. 06/13/05

Overheads at Exit 10, including a button copy panl for U.S. 6/202-NY 22 south, were replaced in 2019. 06/26/05

South at

This guide sign preceding the exchange taking NY 22 south onto U.S. 6/202 west was replaced after 2008. 06/26/05

Replaced by a series of ground level signs, this sign bridge on NY 22 south at Exit 10 was removed after 2008. 06/26/05

South End – Purchase, New York

South at

Two miles north of the directional T interchange with Interstate 287 on I-684 southbound. 05/31/22

Traffic partitions in one mile for the south branch of I-684 (Route 984J) to Hutchinson River Parkway, and the mainline west to Interstate 287 at White Plains. 05/31/22

Hutchinson River Parkway extends south from Merritt Parkway (Connecticut Route 15) to Mount Vernon and the Bronx in New York. 05/31/22

An end shield formerly preceded the wye interchange (Exit 1) with Route 984J to Hutchinson River Parkway. 08/29/05

Southbound at the left exit for Route 984J to Hutchinson River Parkway. Trucks are advised to remain along I-684 due to the restriction of commercial vehicles on the parkway south into New York City. A separate interchange however joins Route 984J with Manhattanville Road. 05/31/22

Interstate 684 splits with ramps for I-287 (Cross Westchester Expressway) to the immediate west. I-287 constitutes a regional bypass route of the New York metropolitan area east to I-95 at the city of Rye and west across the Governor Mario M. Cuomo Bridge (I-87) to Nyack. 05/31/22

East at

Button copy sign posted a half mile west of the directional T interchange (Exit 9A) with I-684 north on Interstate 287 (Cross Westchester Expressway) eastbound. 08/19/21

Interstate 684 travels 17.5 miles north from I-287 to Katonah and 28 miles to I-84 outside the village of Brewster. 08/19/21

Exit 9A parts ways with I-287 east for both Interstate 684 north to Brewster and adjacent Westchester Avenue south to Bryant Avenue. 08/19/21

West at

I-287 (Cross Westchester Expressway) advances a half mile west from the Corporate Park Drive overpass at milepost 7 to Exit 9 A for Interstate 684 north. 05/31/22

Exit 9 A leaves Interstate 287 west for I-684 north beyond the Bryant Avenue overpass at White Plains. An adjacent entrance ramp connects with I-684 from Westchester Avenue. 05/31/22

North at

A cloverleaf interchange (Exit 15) joins Hutchinson River Parkway with Westchester Avenue, the frontage road system along I-287, just prior to the split with Route 984J north to Interstate 684. 03/28/23

Exit 15 A leaves Hutchinson River Parkway northbound for Interstate 287 east. I-287 concludes in 3.4 miles at I-95 along the Port Chester and Rye city line. Left Exit 16 A follows for I-684 north in 0.6 miles. 03/28/23

Hutchinson River Parkway expands to four northbound lanes from I-287 to the wye interchange (Exit 16) with Route 984J. 03/28/23

Hutchinson Parkway turns east and weaves between neighborhoods in Purchase and Rye Brook to the state line where Merritt Parkway takes over. Route 984J branches northwest to The Centre business park and the I-684 mainline from I-287. 03/28/23

Sources:

Summa, Michael. Personal email.
RTE I84 over RTE 6, E BR CROTON RIVER, Putnam County, New York. BridgeReports.com.

Page updated April 5, 2023.