Investigations into replacing the Warroo Bridge over the Lachlan River near Forbes have begun.
Transport for NSW Director Western Region Alistair Lunn said the NSW Government was providing $500,000 of development funding to investigate options for replacing Warroo Bridge with a new concrete bridge.
"The Warroo Bridge was built in 1909 and has served the community for 110 years," Mr Lunn said.
"The bridge was on the list of timber truss bridges to be preserved but following investigations, it has been removed from the list and the NSW Government is investigating options to replace it with a concrete bridge."
Transport for NSW said there were more than 400 timber truss bridges built in NSW between 1860 and 1936.
Of those, 48 remain and 39 are managed by Transport for NSW.
Paytens Bridge over the Lachlan River near Eugowra is another one of those, it has also been removed from the list of timber truss bridges to be preserved.
The Transport for NSW media release says they will continue to maintain Paytens Bridge to fulfil network requirements until a new bridge is built.
"Those bridges removed from the list will be progressively replaced and removed with appropriate heritage interpretation signage to be installed at these locations to provide a historical record," the Transport statement said.
At Warroo, they are now carrying out investigations into future options - including drilling holes into the riverbed to assess conditions for future work.
The work will take place from a barge on the water between 7am and 6pm from Monday to Friday and take two weeks to complete, weather permitting.
No traffic impacts are expected.
"Transport for NSW is working with Forbes Shire Council on a strategic design for the new Warroo Bridge, and will present the design to the community in the near future," Mr Lunn said.
For more information about the Timber Truss Bridge Strategy, please visit rms.work/timbertrussbridge