San Francisco – Oakland Bay Bridge

This high-profile project consists of six major segments: West Approach, West Span, Yerba Buena Island Transition, Self-Anchored Suspension (SAS), Skyway and Oakland Touchdown. The SAS was the most complex and the largest single public works projects in California at the time. It is the world’s largest single tower self-anchored suspension bridge with a design life of 150 years. The Oakland Touchdown (OTD) connects I-80 in Oakland with the new side-by-side decks of the East Span of the SFOBB.

CALTROP, under a contract with Caltrans District 4, provided quality assurance, fabrication oversight, dimensional surveying, materials engineering and risk management for the construction of this unique project. This included the management of a staff of 100 engineers, inspectors, technicians, administrators and managers working around the clock in five countries: China, Japan, Korea, England and the U.S.

CLIENT: Caltrans District 4
PROJECT VALUE: $1.4 billion, $6.5 billion program cost


  • Self-Anchored Suspension Bridge
  • Work Over Water
  • Work in Confined Space
  • 24 / 7 Construction


  • Quality Assurance
  • Source Inspection and Materials Engineering
  • Fabrication Oversight Safety
  • Concrete Inspection
  • Structural Steel Inspection
  • Coating Inspection
  • Plant Inspection