Southern Gateway - Perth to Bunbury

Murray River, South Yunderup and Mayfield Drain Bridges construction; formwork, concrete, steel work, precast drain installation and head walls

The new Perth to Bunbury Highway (NPBH) was a large scale infrastructure project, involving design and construction of 70.5 km of dual carriageway. The highway was under construction as a single project and extended the dual carriageway from Kwinana Freeway at Safety Bay Road in Baldivis, around the eastern side of the Peel Inlet and Harvey Estuary to join the existing dual carriageway on Old Coast Road at Lake Clifton.

The Highway was constructed to freeway standard from Safety Bay Road to South Yunderup, a distance of some 32 km. The remainder of the route (38 km) will be built as a rural highway, with the ability to upgrade it in the future as traffic demands increase. The project doubles the length of the existing freeway network and provides a high standard inter-regional road link that will improve transport connectivity and road safety.

Fremantle constructions was engaged by the SGA to build:

  • 2 x 220m bridges sub and superstructure.
  • 2 x substructure of 220m bridge through a river
  • 3 x 70m dual carriageway two span bridge
  • 42 x drainage structures, from 10m single 600mm centres Structure through to 130lm 2m height x 12m wide structures
Mandurah to Bunbury, Karnup bridge, Safety bridge, Paganoni bridge
Main Roads WA
Southern Gateway Alliance (SGA)
14 months