Old Mandurah Traffic Bridge Replacement, Australia

Aerial view of Old Mandurah Bridge

The Western Australia (WA) Government and the City of Mandurah initiated a plan to replace the existing Old Mandurah traffic bridge in 2013. Construction on the new replacement bridge is expected to begin by the end of April 2016.

The new bridge will improve vehicular capacity with two traffic lanes in each direction, and enhance safety for pedestrians and cyclists by providing separate, wider facilities over the bridge.

"The new bridge will improve vehicular capacity with two traffic lanes in each direction, and enhance safety for pedestrians and cyclists."

State-owned Main Roads Western Australia will supervise and manage the bridge replacement works. More than 24,000 vehicles pass through the bridge each day.

Project location and background

Built in 1953, the Old Mandurah Traffic Bridge is a two-lane structure located on the Old Coast Road in Halls Head in Western Australia. The 63-year old bridge has reached end of its life and is not in a position to cater to the growing local traffic due to the increased population growth in the area.

The existing bridge is 186m-long with 23 spans, has a width of 9.17m with 6.7m-wide carriageway, and a 1.75m-wide footpath. The bridge has been restricted to allow vehicles below 17t since 2006.

In November 2012, a Community Reference Group (CRG) was established by the Minister for Transport, which included members from the local government, industry and community interest groups, as well as a team of specialist technical advisers to ensure the community was well-represented during the redevelopment of the bridge.

The CRG selected design for the redevelopment of the Old Mandurah Bridge after conducting extensive community consultation in May 2013. The contractors for the bridge replacement were shortlisted in March 2015.

Design and features of the replacement bridge

The new replacement bridge will include four lanes and a 5m-wide shared path walkway separated from the road thoroughfare. It will also include fishing platforms and boardwalks accessible from the eastern and western foreshores.

A section of the old bridge, including certain columns, will be retained for the use of new replacement bridge.

Security and safety of travel on the new bridge will include improved through streetlighting designed by architects, and lighting above the shared path. The bridge clearance will be increased to match the clearances available throughout the Port Mandurah canals.

Construction of the replacement bridge

The smoking ceremony was held at the project site in April 2016 and the bridge construction works are expected to begin by the end of April 2016.

The preliminary construction works on site including removal of two Norfolk Pine palm trees on the eastern foreshore are expected to be completed by mid-May 2016. The construction site will be fenced for safety from May 2016 through late 2017.

Contractors involved

Western Australian construction company Georgiou Group was awarded the design-build contract for the project in February 2016. The scope of works include decommissioning the existing bridge and providing design and construction services for the new bridge.

It further includes associated road works, public amenities and infrastructure.

Financing for the Old Mandurah bridge replacement

The bridge replacement project is estimated to be completed with an investment of $51.8m. It is funded with $40m from the state government through the Department of Transport, $8.8m from the state government's Royalties for Regions programme, and $3m provided by the City of Mandurah.