• South Island Swing Bridge

  • South Island Swing Bridge

  • South Island Swing Bridge

  • South Island Swing Bridge

  • South Island Swing Bridge

  • South Island Swing Bridge

  • South Island Swing Bridge

  • South Island Swing Bridge

  • South Island Swing Bridge

< back to projects

South Island Swing Bridge

 

  • Owner:  Yawkey Foundation
  • Construction Cost: $677,300
  • Completion Date: January,2015

Scope of Services:

  • Demolition of Mainland and Island Side existing ferry ramps
  • Construction of new Mainland and Island Side Fixed Piers
  • Construction of Wood pile dolphin and steel pile fenders
  • Installation of 180 x 30’ barge supplied by owner
  • Associated lighting work

Cape Romain has been contracted by the Yawkey Foundation to remove the existing Ferry system going to South Island in Georgetown County and install a new Swing Bridge system for access to the island. South Island is separated from the mainland by the AIWW. The new infrastructure consists of a fixed pier on each side of the inland waterway and a motorized barge with ramps . The barge will have one 24” diameter pipe pile that it pivots on. When vehicle or truck traffic needs to enter or exist island, the barge will be swung across waterway and barge ramps will be lowered onto fixed piers to make a continuous bridge from shore to shore. When not in use , barge will be rotated to side in order for marine traffic to pass. Because waterway will be obstructed at times, all lighting will be in accordance with US Coast Guard requirements.
The fixed piers are constructed on greenheart pile with a concrete deck. There are also dolphins of greenheart pile and barge fenders with steel HP pile. The barge pivot pile is a steel pipe pile. All pile have different bearing and tip elevation requirements. To protect normal road traffic, there are two heavy duty security gates when bridge system is open for marine traffic