Coolumbooka River Bridge will undergo essential repair work from this month to protect the heritage listed structure into the future.
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A Transport for NSW spoke said this important work would ensure the bridge remains safe for all motorists.
"Transport for NSW will carry out the work from Monday, August 26 for about 12 weeks, weather permitting. While the bridge is safe to use, this work is needed to ensure the bridge continues to perform into the future for all motorists who use Cathcart Road," the spokesperson said.
"Investigations carried out on the bridge on Cathcart Road discovered signs of deterioration on the underwater piles and the bridge trusses.
"Initial maintenance work was then carried out, and further maintenance is planned to retain the structural integrity of the historically significant structure."
The spokesperson said the first stage of work will involve installing temporary support piles and a steel support structure, with stage two to install an additional bridge support system and replace parts of the truss, scheduled for 2020.
The single lane, six-span bridge, connecting Bombala to the coast, was completed in 1892 and is one of the seven remaining McDonald timber truss road bridges in NSW, and has a load limit of 42.5 tonnes.
Work will be carried out between 7am and 6pm Monday to Friday and 8am to 1pm Saturdays.
During the first six weeks of work, the bridge will close to traffic during work hours and detours will be in place.
All motorists may detour via Black Lake Road and the Monaro Highway and are advised to allow up to 35 minutes additional travel time.
For the remaining six weeks of work, intermittent bridge closures, up to 30 minutes, will be in place as steel structures are installed to support the new bridge piles. The community will be kept informed regarding this work.
Changed traffic conditions including traffic control and a reduced speed limit of 40 km/h will also be in place on Cathcart Road during work hours for the safety of workers and motorists.
Motorists are advised to follow the directions of signs and traffic control and allow additional travel time.
Transport for NSW thanks motorists for their patience during this important work and will continue to update the community on the repairs to Coolumbooka River Bridge.