Captain Cook Highway restoration provides future protection

26 February 2026

For many visitors to Far North Queensland, driving the Captain Cook Highway is a bucket list experience.

Connecting Cairns and Port Douglas, with lush tropical rainforest on one side and the sparkling Great Barrier Reef on the other, the highway is a strong driver for local tourism and the region's broader economy.

The road's importance was under the microscope in late 2023, when the tail of Tropical Cyclone Jasper caused extensive damage to the highway, forcing its closure and isolating communities.

Intense monsoonal rains brought on by Jasper broke more than a century of flood records, with some areas experiencing a deluge that exceeded a one-in-1000-year rainfall event.

The downpour triggered massive slope failures across the Far North, including on the Macalister Range through which the Captain Cook Highway winds.

Cascading torrents of mud, boulders and vegetation poured down the mountain, carving new gullies and waterways and stretching debris across the road.

Landslip runoff speeds reached up to 20 cubic metres per second, enough to fill an Olympic-sized swimming pool in just three seconds.

Approximately 30,000 tonnes of mud and debris from more than 120 landslips buried Captain Cook Highway, which also suffered areas of coastal undermining and damage to 48 culverts.

Such catastrophic impacts called for innovative solutions, and that’s exactly the approach Queensland’s Department of Transport and Main Roads (TMR) took to restore the highway.

A key aspect of the works included the installation of debris-flow barriers, which catch boulders and vegetation while still allowing water to flow through to culverts and drains.

These barriers, a first for state-roads in Far North Queensland, reach heights up to six metres and can span up to 40 metres in length in some locations.

They are engineered to stand up to immense forces, up to 1,800 kilograms per square metre, the same force exerted by about four family sedans stacked one on top of the other.

This smart solution now acts as a safeguard for the highway, intercepting debris before it reaches the road, while allowing heavy volumes of water to pass through.

Additional geotechnical treatments included soil anchoring and reconstructed embankments, helping to stabilise areas most prone to slope failure.

The Captain Cook Highway restoration project was jointly funded by the Australian and Queensland Governments through the Disaster Recovery Funding Arrangements (DRFA).

With the resilience of the road now secured, visitors driving the iconic route can bring their focus back to the rainforest and reef once more.

Massive slope failures on Macalister Range during ex-Tropical Cyclone Jasper saw torrents of mud, boulders and vegetation pour onto Far North Queensland's Captain Cook Highway in late 2023.

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Approximately 30,000 tonnes of mud and debris from 120 landslips buried the highway and damaged 48 culverts.

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During reconstruction works following the event, TMR crews installed debris-flow barriers to catch boulders and vegetation during future disaster events while still allowing water to flow through to culverts and drains.

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The barriers reach heights up to six metres and are engineered to take up to 1,800 kilograms of force per square metre.

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This resilient solution now acts as a safeguard for the highway, intercepting debris before it reaches the road while still letting heavy volumes of water pass through.

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Other geotechnical treatments carried out during repairs included soil anchoring and embankment strengthening, helping to stabilise areas prone to slope failure.

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