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I-287 Cross Westchester Expressway

The I-287 Cross Westchester Expressway is the primary east/west roadway in central Westchester County with an ADT of over 120,000 vehicles. The I-287 corridor is an important link for interstate travel and commerce between New York, New Jersey, and Connecticut. This expressway is one of the regions most congested corridors north of the New York City metropolitan area.

Bullet Reconstruction of six-lane expressway
Bullet Design of four new/replacement bridges

The reconstruction of the Cross Westchester Expressway (CWE) from Interchange 8 to the Saw Mill River Parkway was a complex highway reconstruction and bridge replacement project. The project included the reconstruction of 1.6 kilometers of the six lane expressway and the design of four new/replacement bridges at the new I-287/I-87 Interchange. Due to the large ground surface elevation variation within the new interchange, WSP USA also designed 14 retaining walls approximately 3 kilometers long, varying in height from 2 to 17 meters high. 

WSP was responsible for the design of four new/replacement bridges at the new I-287/I-87 Interchange. The four structures included the replacement of the I-287 structure over Route 119, replacement of the Ramp V over I-87, and construction of the I-87 Northbound Bridge over I-287 Eastbound Connector.

Exit 8E Interchange:

NYSDOT Region 8 appointed WSP to provide final highway design and preliminary through final structural design for the reconstruction of the Exit 8E interchange area.

With a construction cost of $53 million, key work included:

  • Replacement of bridges at Anderson Hill Road and White Plains Avenue 
  • Construction of new bridge carrying Westchester Avenue eastbound over Ramp M
  • Construction of new culvert carrying Westchester Avenue westbound over the Mamaroneck River
  • Extension and repairs to five culverts over the Mamaroneck River
  • Construction of 400+ feet of new retaining walls
  • Approximately four miles of new roadway construction or existing roadway reconstruction, including ramps, service roads and local streets
  • Complete replacement of two signalized intersections with associated actuation
  • Drainage and stormwater treatment improvements
  • Wetlands impact mitigation
  • Landscaping

Bond funding restrictions dictated an accelerated completion schedule, allowing less than one year from design approval to document submission and WSP successfully achieved this goal working collaboratively with all stakeholders.