The $51.8 million replacement of Mandurah Bridge was part of a scope of works that included the decommissioning of the existing bridge and the design and construction of a new bridge over the Mandurah Estuary, including associated roadworks, public amenities and infrastructure.

Initiated in January 2016 and completed in March 2018, the new Mandurah Bridge serves to boost traffic capacity and stands as an iconic structure, offering improved amenities at the heart of the Mandurah for the community.

The existing structure was deteriorating and required an upgrade to expand capacity to two traffic lanes in each direction and improve safety for pedestrians and cyclists via separate and wider facilities over the bridge.

BG&E provided bridge design, civil and structural engineering, and flood modelling and hydrology services for replacement of the bridge, which runs over the Mandurah Estuary and into the surrounding marina precinct.

Our solution included adopting a unique curved soffit cross section constant along the full length of the 243 metre long bridge, resulting in a cost-effective landmark structure with a strong aesthetic appeal.

The bridge comprises six spans with 42 metre long internal spans and 37.6 metre long end spans. The post-tensioned superstructure is supported on elegant columns that are constructed on piled foundations.

The new bridge includes lower-level wide shared paths which enable greatly improved pedestrian experiences, such as fishing platforms, public art and landscaping.