HDR is Lead Designer for new Tappan Zee Bridge

(February 26, 2013) - The design-build contract for the Tappan Zee Hudson River Crossing was approved recently by the New York State Thruway Authority Board of Directors. HDR is the lead designer, and a subcontractor, for Tappan Zee Constructors, a consortium that includes Fluor Enterprises, American Bridge Company, Granite Construction Northeast, and Traylor Bros.

As lead designer, HDR is responsible for overall design project management, overall quality control including peer review and independent design check process, detailed design elements including deep foundations, main span and approach span structures, highway elements including alignments, tolling and ITS, utilities and facility design.

The bridge is designed for a 100-year service life and will be mass-transit-ready for bus rapid transit on the span, or for commuter or light rail on structures between the two spans.

Key features will include:

  • Twin 3-mile structures with 1200-foot cable stayed main span bridges carrying eight general traffic lanes plus emergency lanes and extra-wide shoulders for immediate express bus service when opened.
  • A new toll plaza with at least three highway speed E-ZPass lanes and a dedicated bicycle and pedestrian path on the northern span.
  • Safe scenic overlooks, with anti-climb fencing and security cameras to be monitored 24 hours a day.
  • Strength and capacity provisions to accommodate various mass transit modes.

HDR is a global employee-owned firm providing architecture, engineering, consulting, construction and related services through our various operating companies. Our more than 8,000 professionals are committed to helping clients manage complex projects and make sound decisions.