Newell Highway Flood Immunity - Newell Highway

Reviewed

Project overview

The Australian and NSW Governments are funding the $187.2 million Newell Highway upgrade, Parkes Bypass. The Bypass seeks to improve connectivity, road transport efficiency and safety for local and interstate motorists. Summary text to be provided The delivery of the northbound and southbound overtaking lanes at Landervale Road about 21 kilometres south of Ardlethan is complete. The Newell Highway Program Alliance (NHPA) completed the delivery of northbound and southbound overtaking lanes and road safety improvement work, about six kilometres north of Grong Grong, in October 2021. The road safety works are funded by the Australian Government. The delivery of the northbound overtaking lane, about five kilometres north of Parkes, is now complete. Work on the two northbound overtaking lane extensions at Tap Hill, about 44 kilometres north of Gilgandra is now complete. The delivery of a new northbound overtaking lane, about six kilometres north of Tocumwal, is now complete. The delivery of the southbound overtaking lane at Fullers Road, about four kilometres south of Finley is now complete. The delivery of the southbound overtaking lane, four kilometres south of Peak Hill, is now complete. The delivery of the northbound overtaking lane at Telescope, about 15 kilometres north of Parkes is now complete. The delivery of the northbound and southbound overtaking lanes at Bundure, about 38 kilometres north of Jerilderie, is now complete. The delivery of two new overtaking lanes, one northbound and one southbound, 26 kilometres south of Forbes is now complete. The delivery of the southbound overtaking lane through Medway Creek, Brocklehurst, north of Dubbo is now complete. The delivery of two overtaking lanes, one northbound and one southbound, south of Gilgandra are now complete. The Newell Highway Program Alliance (NHPA) will commence the construction of a new southbound overtaking lane, about two kilometres north of Forbes, in May 2022. Safety improvement work, about six kilometres north of Tocumwal, was completed in June 2022. Work on new northbound and southbound overtaking lanes at three locations at Pilliga, between Coonabarabran and Narrabri started in June 2022. The delivery of the new northbound and southbound overtaking lanes at the multiple locations will take about 12 months to complete, weather permitting. The delivery of northbound and southbound overtaking lanes, about eight kilometres north of Gilgandra was completed in January 2020. The Newell Highway Program Alliance is delivering about 40 additional overtaking lanes and various safety upgrades along the Newell Highway, within about four years. The Newell Highway Program Alliance (NHPA) will commence the construction of a new southbound overtaking lane at Mirrool, about 15 kilometres north of Ardlethan, in April 2021. Work on new northbound and southbound overtaking lanes near Back Creek, about 19 kilometres north of West Wyalong, has started and will take about ten months to complete, weather permitting. The Newell Highway Program Alliance (NHPA) will commence the construction of a new pair of overtaking lanes and safety improvement work, 20 kilometres south of Forbes in June 2021. The Newell Highway Program Alliance (NHPA) completed the delivery of a southbound overtaking lane extension, about 26 kilometres south of Coonabarabran, in October 2021. Safety improvement work, near Alleena about 20 kilometres south of West Wyalong was completed in January. The Australian and NSW governments have committed funding to upgrade the Newell Highway between Mungle Back Creek and Boggabilla in Northern NSW. This will improve safety for motorists and reduce future maintenance requirements. The NSW Government has committed $200 million to provide flood immunity on various sections of the Newell Highway between West Wyalong and Forbes. The New South Wales Government is providing $11.5 million for planning of an upgrade of the Newell Highway at Coonabarabran. This work is part of the $500 million Newell Highway upgrade program. The Australian and NSW Governments have recently completed the upgrade of the Newell Highway and Mitchell Highway intersection as part of the $301.2 million Building a Better Dubbo program to cut down travel time, make roads safer and ease congestion in and around Dubbo. The Newell Highway is the longest highway in NSW, stretching over 1060 kilometres from the Victorian border at Tocumwal to the Queensland border at Goondiwindi, and is a National Highway. The NSW Government has committed $8.8 million to develop design concepts for the widening of the Newell Highway between Coonabarabran and Narrabri through the Pilliga – known as the Pilliga Widening project. The Australian and NSW Governments are investing $40 million to upgrade the intersection of the Newell Highway and Oxley Highway, four kilometres northeast of Coonabarabran.

Aerial image of flooding between West Wyalong and Forbes in 2016.

Latest news

JUL2022

JUL 2022Investigation continues

Work has been ongoing to investigate and develop a number of potential options to improve flood immunity to several sections of the Newell Highway between West Wyalong and Forbes. A comprehensive flood study, which includes modelling of the Lachlan River and Lake Cowal, has been developed. This flood study will be used to help inform which options can be used in each location. Options that are being considered include improved drainage, raising of the road, bridges and pavement improvements.


Improving flood immunity on these sections of the Newell Highway is complex and it is important that the appropriate development work is carried out. Once we have completed this stage, we will be able to advise what options are being progressed further and when we can start on the environmental approval process.

SEP2021

SEP 2021Project update

The preliminary environmental investigation is now complete and the project has now reached strategic and concept design stage. During the environmental investigations, work included reviewing existing flood studies and preliminary identification of flora and fauna species along the length of the project.


Project Information

The Newell Highway is prone to flooding between West Wyalong and Forbes and has a history of road closures during periods of heavy rain and flooding in the Lachlan Catchment.

In September 2016 the West Wyalong to Forbes section of the highway closed for 43 days and in total 20 kilometres of this section was flooded.  

Transport for NSW has started investigating potential flood immunity solutions for the Newell Highway between Compton Road, West Wyalong and Hereford Street, Forbes. The proposal is expected to be delivered in sections improving up to 20 kilometres of the 110 kilometre length between the two towns.

Key features of the proposal could include:

  • increasing the height of the highway to meet the flood immunity objectives
  • pavement, bridge and drainage improvements to allow water to pass freely under the highway
  • ancillary works including safety barriers, signage, line marking, landscaping and environmental protection works as required

The primary objective of the proposal is to achieve a trafficable road network between West Wyalong and Forbes that:

  • achieves a minimum flood immunity (one lane-each way dry and trafficable for all vehicles) for a 1 in 20 annual recurrence interval
  • assesses and value manages options for flood immunity and flood passable for up to a 1 in 50-year flood event

The Preliminary Environmental Investigation is now complete and the next stage of the project is strategic and concept design.

This stage of design will include field and data collection, flood modelling and analysis, option selection, road design, estimating, further environmental assessment and extensive consultation with nearby landholders and key stakeholders.

Transport for NSW will continue to keep the community informed as the project progresses.


Project documents


Project updates

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 September 2021 project update

Newell Highway Flood Immunity, West Wyalong to Forbes.

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Reports

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 Preliminary Environmental Investigation

Newell Highway - West Wyalong to Forbes Immunity Project Preliminary environmental investigation June 2021.

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Media releases

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 10 August 2021

Major step taken in Newell Highway flood immunity project

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