International Bridge Technologies

Charles W. Cullen Bridge – Rehoboth Beach, Delaware

Technical details
State of Delaware Department of Transportation

Construction Completed: 2011

Rehoboth Beach, Delaware
Design/Build Contractor: Skanska USA, Prime Consultant: AECOM
SYSTRA IBT’s Role: Subconsultant for cable-stayed spans, concept design, and detailed design in association with AECOM.


Main Span: 950 ft (289 m)

Bridge Length: 2,600 ft (792 m)

Width: 106 ft (32 m) (four traffic lanes, shoulders, and a sidewalk).

The bridge is divided into a 1,750 ft (533 m) long cable-stayed span unit and 850 ft (259 m) long approach spans. The cable-stayed main span is 950 ft (289 m), providing a minimum horizontal clearance of 900 ft (274 m) for the Inlet. The required vertical clearance over the 200 ft (61 m) wide navigation channel is 45 ft (14 m) with a maximum grade of 4% for the roadway profile.

The superstructure components include edge girders, floor beams, and a concrete slab. It is supported by two planes of stay cables anchored in the edge girders. The stay cables are anchored in two vertical reinforced concrete pylons with steel beams connecting two opposite stay anchorages to resist tensions across the pylon section. The floor beams and edge girders are post-tensioned. The top slab is also post-tensioned longitudinally in the vicinity of the transition piers and the center portion of the main span.

The foundations for the main span unit consist of 36 in x 36 in 914 mm x 914 mm pre-stressed piles. The cable-stayed spans were built on falsework over land and in cantilever with a travelling form for the portion of the main span located over water.


  • 2014 American Road & Transportation Builders Association – Transportation Development Foundation Globe Award
  • 2013 ACEC Delaware Chapter – Grand Conceptor Award
  • 2013 ACEC – Engineering Excellence Awards, National Recognition Award
  • 2013 ASBI Bridge Award of Excellence
  • 2013 AGC of America/Alliant Build America – Best Design-Build Highway & Transportation Project
  • 2012 ASCE Delaware Chapter – Outstanding Large Project of the Year

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