Hume Highway Sheahan Bridge

[Nihat]

Planning for the upgrade or replacement of the original bridge. Can't see it being replaced though, strengthening most likely the best option. 

https://www.nsw.gov.au/ministerial-releases/contract-awarded-as-sheahan-bridge-upgrade-planning-project-progresses

The Albanese and Minns Labor governments are progressing plans for an upgrade of a key bridge on one of Australia’s busiest road freight corridors, as part of efforts to unlock access for more heavy vehicles.

The $20 million jointly funded planning project for the Sheahan Bridge Upgrade project on the Hume Highway at Gundagai has moved into its next phase of development with a contract awarded to provide a concept design for the bridge’s upgrade or replacement.

WSP Australia Pty Ltd will provide concept design development and environmental assessment of potential upgrade or replacement options for the northbound bridge over the Murrumbidgee River.

The current northbound bridge was built in 1977, with duplication of the southbound lanes officially opened to traffic by Prime Minister Anthony Albanese on 25 May 2009 when he was Minister for Infrastructure and Transport.

While the load limit was increased from 68 to 85 tonnes in 2020 on the northbound bridge, for the safety of motorists Higher Productivity Vehicles still have to use a permit to travel on the NSW section of the Hume Highway due to the age of the bridge and structure limitations.

These limitations on the northbound bridge also restrict opportunities for contraflow during emergency response or planned maintenance activities on the southbound bridge.

The Federal and NSW Labor Governments are working together to ensure that this major bridge on the Hume Highway, the oldest and busiest highway in NSW, which follows the 200-year-old track traversed by Hume and Hovell in 1824, can meet the challenges of 21st century road freight.

The upgrade planning project will investigate potential solution options which include:

• building a replacement bridge on a new alignment upstream (east) or downstream (west) of the existing bridge
• replacing the existing bridge on its current alignment
• strengthening the existing bridge.

Transport for NSW is now working with the contractor to further investigate each alternative and identify a preferred option.

It is expected a preferred option will be identified for public display in mid-2026 and Transport will keep the community updated as the project progresses.

Minister for Regional Transport and Roads Jenny Aitchison said:

“The Hume Highway is the major freight corridor from Sydney to Melbourne, the oldest and busiest highway in Australia. It has been Labor governments which have invested and delivered the crucial upgrades that have ensured freight, tourism and other road users can rely on this vital network.

“Instead of forcing HPVs to use permits, the NSW and Federal Labor governments are working together to deliver a fit for purpose bridge which will reduce red tape for HPV freight operators by enabling them to use this route without having to obtain permits.”

NSW Labor’s spokesperson for Cootamundra Stephen Lawrence MLC:

“All across regional NSW, Labor governments are working together to improve roads, bridges and other transport infrastructure.

“I am very pleased to see the Sheahan Bridge upgrade planning project progressing and look forward to learning what the preferred improvement option is.”

[Paul Rands]

It seems crazy to replace the bridge as in my mind its not that old, but the reality is that it is almost 50 years old and the route is a far cry from what it was back when the bridge was built. Presumably the new bridge will be a clone of the later bridge.

Paul R

li...@paulrands.com

http://www.expressway.net.au/

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[Nihat]

Contrary to what I thought replacing the bridge entirely is the preferred option

https://www.transport.nsw.gov.au/system/files/media/documents/2026/sheahan-bridge-upgrade-hume-highway-gundagai-option-report-july-2026.pdf

https://www.transport.nsw.gov.au/projects/current-projects/sheahan-bridge-upgrade

https://www.transport.nsw.gov.au/system/files/media/documents/2026/King-Aitchison-Preferred-option-for-Sheahan-Bridge_0.pdf

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[Dean Sherry]

Speaking of bridge replacements, one bridge that should be replaced but is instead being strengthened is the westbound bridge over the Bremer River on the Warrego Highway in Ipswich.  It has been in use since 1959 and there have been speed and load restrictions on it for some time now.  I think strengthening is the wrong option here because the highway is planned to be six-laned soon and they'll have to build a new bridge anyway as part of that project.  In my opinion TMR are better off replacing it now rather than strengthening it only to replace it 5-10 years later.

[Michael Faria]

My guess is that if they six-lane the Warrego Hwy they'll widen the eastbound bridge and run it as four lane-two way while they replace the westbound bridge, that way they aren't running the road as only one lane each way if they replaced it now.

There's the abandoned Sturt Hwy bridge over the Murray River at Blanchetown, SA, built 1964 but replaced 1998 due to insufficient strength.

[Brad Forbes]

Seems like a short lifespan for that South Australian bridge, just over 30 years and replaced?

[Dean Sherry]

There's also the old Talbragar River bridge on the Newell Highway (one of the last steel truss bridges built in NSW), built in 1966 and replaced in 2002.

And perhaps the worst offenders are the group of bridges on the M1 between Beenleigh and the Gold Coast that only lasted like 10 years before they were replaced.

[Michael Faria]

I think it's impressive how well bridges were built back in decades long gone. Replacements due to deterioration or insufficient strength are really quite rare.

The distinctive 1936 concrete arch bridge over Shark Creek on the Pacific Hwy replaced a 1916 concrete bridge which began to decay after only ten years.

[Aevion]

I'm quite surprised they didn't go for a full replacement of the Bremer River bridge; it's going to make things tough when they come through there with extra lanes. There are a few things on that bypass section that could do with some work.... mind you I've seen worse down here.

I'm even more shocked that the Gundagai bridge has to be replaced. Didn't see that one coming! To me 1977 really doesn't seem that old for a bridge, but I guess it is now.

I believe there were a few bridges in regional WA that were built in the 1960's, only to be replaced by the 1980's, but I can't recall them off the top of my head.

On Thursday, 30 July 2026 at 15:17:20 UTC+10 Michael Faria wrote:

[Aevion]

The one at Peachey Road I think had the shortest lifespan of all of them; opened in July 1991 and was removed by mid-1999. I guess at the time the Goss Government were pretty intent on moving the highway completely rather than upgrading it like the successive governments did.

[Michael Faria]

With the Sheahan Bridge at Gundagai it's not the age that's the problem it's the fact it was built to a lower mass standard and is now the last obstacle on the Hume blocking higher vehicle classes. The preferred option report indicates the entirety of the structure would need strengthening so really it would be easier to just demolish and replace it. The requirement to provide a 3 m separation from the old bridge seems silly because it means modifying the road and ramps at either end.

It's interesting that there's still bridges on the Pacific dating to the 1940's that work fine.