Charleyong Bridge

Roads and Maritime Services is planning the replacement of Charleyong Bridge over the Mongarlowe River, Marlowe. The bridge is located on Main Road 92 connecting Braidwood and Nowra via Nerriga. The project forms part of the NSW Government's Bridges for the Bush program which has been allocated $14.3 million in the 2017/18 budget.

The current Charleyong Bridge over the Mongarlowe River, Marlowe

Updates and announcements

Consultation with local properties

A small number of properties are affected by this project. All affected property owners have been approached and we will continue to work closely with them.

Roads and Maritime has a land acquisition process that will be followed. For general information visit the Roads and Maritime website: Land and property acquisition page.

Identifying a preferred option

Roads and Maritime has investigated various options for the replacement of Charleyong Bridge and has developed a preferred option for the project.

This option was placed on public display, with the accompanying review of environmental factors in mid 2016.

The Charleyong Bridge Submissions Report (PDF, 1.25Mb) summarises the issues raised in the exhibition period and provides responses to each topic.

Community feedback will be used to refine the design during the continuing concept design and project development periods.

For more information see the community update (PDF, 807Kb) or the review of environmental factors (PDF, 5.63Mb).


  • Increased safety due to wider traffic lanes and improved road approaches
  • Ability for Higher Mass Limit vehicles to use the bridge
  • Reduction in expensive and ongoing maintenance costs
  • Timber from the existing bridge to be used in the maintenance of other timber truss bridges.


  • Construction of a new bridge upstream of current bridge location on improved alignment
  • Construction of about one kilometre of sealed approach roads
  • Removal of tight unsealed curves
  • Approach to tie in with Nerriga Road immediately west of Tomboye Road intersection
  • Removal of the existing bridge.

Replacing the existing bridge

The Charleyong Bridge is a single-span Allan truss timber bridge built in 1901.

The bridge is proposed to be replaced under the Timber Truss Bridge Program as it does not meet current loading standards and has become increasingly expensive to maintain.

Recent inspections of the existing bridge and road approaches have confirmed various structural and functional deficiencies due to the ongoing deterioration of the timber piers and trusses.

The bridge is located on Main Road 92 which is a regionally important link for goods, quarried material and stock between Nowra, Braidwood and Canberra.

Replacement of the bridge would greatly improve regional and local freight route continuity and allow Higher Mass Limit Vehicles to use the road.

Managing and conserving NSW’s Timber Truss Bridges

The Charleyong Bridge forms part of the Roads and Maritime Services’ Timber Truss Bridge Strategy.

The strategy provides guidelines for the long term management and conservation of the 48 Timber Truss Bridges that we currently manage.

It is not sustainable to retain all 48 bridges given the required operational and safety upgrades for each structure along with high maintenance costs.

The strategy has identified a number of locations, including Charleyong, where a modern structure is required to meet increasing freight loads.

Timber from the Charleyong Bridge will be used in the rehabilitation of other timber truss bridges located within NSW.

The Charleyong Bridge is not listed on the State Heritage Register.

Next steps

Roads and Maritime will continue to work closely with Queanbeyan-Palerang Regional Council and other key stakeholders in the planning and development of the project.

Funding for the project forms part of the NSW Government’s Bridges for the Bush Program.

The NSW Government has committed to improving road freight productivity through the replacement or upgrading of 17 separate bridges in rural and regional NSW over the next five years.

Roads and Maritime will continue to work closely with affected properties, agencies and stakeholders throughout the project.

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