OPAC Consulting Engineers

SFIA Elevated Circulation Roads

San Francisco, California


Airport Commission
City and County of San Francisco, CA
Willie Tsai
Project Manager
Tel. 650-872-5942


Construction completed 2000

Scope of work:


Construction cost:

US$ 75,000,000

Services Performed:

  • Conceptual design and type selection
  • Final design
  • Engineering support during construction


  • San Francisco Art Commission review process
  • Non-standard bridge design
  • Design for highs seismic zone
  • Coordination with multiple concurrent projects

The Elevated Circulation Roads at the San Francisco International Airport (SFIA) provide access to and movement between the new International Terminal, existing Domestic Terminals, US101, new North and South Parking Garages, and existing ground level roadways. The structure consists of single level and double-deck cast-in-place concrete box girders with curved fascia. The single level portions consist of prestressed concrete superstructure and the double-deck portions consist of reinforced concrete superstructure. Deck widths vary from 23'-6" for single lane to 47'-6" for three lanes. Span lengths vary from 50 feet to 130 feet. Columns are reinforced concrete supported on groups of 24" diameter steel pipe piles filled with concrete.

The Parsons-OPAC-AGS Association was selected for the design of the Elevated Circulation Roads. Services provided include conceptual design, preliminary design, design development, cost estimates, production of construction contract documents, assistance during bidding of the construction contract, and engineering services during construction.

OPAC was responsible for developing alternative planning schemes and preparing the type selection studies used by the Airports Commission to select the alternative to build, as well as providing services for the full design.