The Casey Arborway

Multiple modes expanded and improved while respecting history

Boston, Massachusetts

  • Reconnected Boston’s historic Emerald Necklace
  • Improved and expanded multiple transit modes
  • Created new and safer pedestrian and bicycle pathways
  • Simplified at-grade roadway network

HNTB demolished the nearly 70-year old William J. Casey overpass and in its place created an at-grade solution that dramatically transformed the Forest Hills neighborhood in Jamaica Plain. Multiple transit hubs were expanded and improved, above ground and below. A commuter rail platform was extended and updated and a new headhouse built, creating safer access points and space for other uses, and intersections were redesigned to facilitate more efficient traffic flow.

Nearly 7 miles of new bicycle and pedestrian paths provide a continuous path for commuters from neighborhoods south of Forest Hills to downtown Boston. A busway was relocated and expanded, and route locations, pickup and drop-off points consolidated, eliminating traffic backups in surrounding neighborhoods. A tunnel that served multiple rail lines received new drainage and emergency ventilation systems.

The project also reconnected a link in the Frederick Law Olmsted-designed Emerald Necklace, a series of six parks connected by greenways and waterways.