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Arnhem Highway - Adelaide River Floodplain Upgrade

Funding Program:Northern Australia Roads Program
Status:Under construction
Transport Mode:Road
Expected Start/Finish:Late 2019 - Late 2021
Estimated Project Cost:$77,880,000
Australian Government Contribution:$62,300,000

Project Description

The Arnhem Highway is the major land transport route between the Stuart Highway and Kakadu National Park. In addition, the Arnhem Highway services the towns and communities of Humpty Doo, Marrakai, Corroboree, Jabiru and Arnhem Land.

The project will upgrade the Arnhem Highway to improve flood immunity at the Adelaide River floodplain including:
- construction of approximately 6.6 kilometres of new road alignment on the existing road corridor, between chainages 30.2 and 36.8km, to a finished road level of approximately 4 metres above the floodplain, including a series of multi-span bridge structures along the length of the floodplain; and
- ground improvements and drainage works between chainages 25.1 and 27.9km at Beatrice Hill.


This project will improve road reliability for road users between the Stuart Highway and Mount Bundy.

The project will provide the following benefits:

  • improved flood immunity at the Adelaide River floodplain
  • increased route reliability and accessibility on the Stuart Highway
  • reduced duration and frequency of road closures, through improved pavement strength and flood immunity


The Australian Government has committed up to $62.30 million towards this $77.88 million project.


Construction works commenced in September 2019 and are expected to be in completed late 2021.

Disclaimer: The material contained in this site is made available on the understanding that the Department is not thereby engaged in rendering professional advice for a particular purpose. Before relying on the material in any important matter, users should carefully evaluate the accuracy, completeness and relevance of the information for their purposes and should obtain appropriate professional advice relevant to their particular circumstances.

Project details last updated: 3/11/2020