Transport NSW this week release a submissions report for the project.

Minister for Regional Transport and Roads Paul Toole said the bridge built in 1893, is one of only four timber McDonald truss bridges remaining in NSW and its restoration will ensure the oldest example of a two-span McDonald truss bridge in NSW is conserved.

"The bridge over Coxs River is not only of significant heritage value, it provides a vital link between Jenolan Caves Road and the Great Western Highway for residents and visitors alike," Mr Toole said.

"When completed, the bridge will have a new deck and stronger supports while retaining the appearance of the original bridge.

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"I know the community has waited for this for a while, so it's very exciting to see this work finally under way."

The work follows the release of the 'Review of Environmental Factors' and the above mentioned report which collected feedback from the community after being on display in November last year.

During the display, 36 formal submissions were made on topics including the design of the bridge, road safety, heritage and the length of detours while the bridge is being restored.

Mr Toole said stage one of the work is expected to start in May with stage two to follow in mid-to-late 2020.

"The first stage of work will include vegetation clearing, relocation of powerlines, site establishment with site compounds and work areas built either side of the bridge and installation of a steel temporary support structure.

"The second stage of the work will include dismantling and restoring the existing bridge components that need to be repaired, strengthening the existing trusses with new steel and timber elements, strengthening the existing foundations with concrete as well as final road work and landscaping.

"The community will continue to be updated as the project progresses," Mr Toole said.

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