Arnhem Highway - Adelaide River floodplain upgrade

The Australian and Northern Territory governments are funding a $77.88 million upgrade of 6.5km of the Arnhem Highway across the Adelaide River floodplain.

The project will reduce road closures during the wet season along the Arnhem Highway due to flooding of the Adelaide River, resulting economic and safety benefits for road users.

The upgraded section of the highway will be built next to the existing road alignment, which will include:

  • raising the height of the road
  • drainage structures (13 bridge structures) along the new alignment.

Stage 1 of the Arnhem Highway upgrade over the Adelaide River floodplain opened to traffic in December 2021.

Stage 2 works

The Northern Territory Government is delivering a second stage of the Adelaide River Floodplain Upgrade to reduce flooding and improve safety and access on the Arnhem Highway.

The stage 2 program is worth more than $29.52 million and is jointly funded by the Australian and Northern Territory governments. This second stage will upgrade a 3km section of the Arnhem Highway with a new four-span bridge at the Beatrice Hill Causeway.

Work on stage 2 started in June 2021.

Completion of the stage 2 works is anticipated by late 2023, depending on the effect of wet season rains and the time it takes for the new road surface to consolidate.

Location of works is shown below.

Map showing stage 2

Last updated: 25 August 2022

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