Customer: Department of Infrastructure and Transport

Contract: Design and Construct

Location: Victor Harbour, South Australia




Project Capabilities

Marine Roads & Bridges

Fast Facts

  • 650 m long, 6 m wide new causeway  
  • New rail line on causeway for historic horse-drawn tram
  • New boat landing facility


McConnell Dowell continues its strong working relationship with the Department of Infrastructure and Transport (DIT) with the contract to design and construct the new Granite Island Causeway.  The awarding of the contract followed a collaborative design development process involved DIT, McConnnell Dowell and the project's designers.

The current Causeway is located on the Fleurieu Peninsula, 83 km south of Adelaide, and is an iconic landmark with considerable heritage value. It is the only link between Granite Island and the mainland at Victor Harbor and is a site of cultural significance to the traditional owners of the area. The Causeway is also a popular tourist attraction, important to the local, regional and state economies.

A condition assessment identified that the original Causeway was approaching the end of its useful life and a feasibility study into the potential upgrade options determined that retaining the existing structure was not viable.

McConnell Dowell is constructing the new Causeway adjacent to the existing one and the scope of work includes: 

  • Construction of a 650m long 6m new marine structure including rail line (for horse-drawn tram) and viewing facilities. The structure is driven piles with a pre-fabricated concrete superstructure.
  • Construction of new boat landing facility on Granite Island.

Subject to approval, decommissioning and partial demolition of the existing Causeway is planned.  All timbers removed from the structure will be stored off site and will be inspected to determine whether the timber is suitable for re-use.