Great Western Highway's Victoria Pass Fully Closed: Heritage Bridge Damage Prompts Three-Month Shutdown
The Great Western Highway at Victoria Pass, including Mitchell's Causeway (also known as The Convict Bridge), has been fully closed to traffic following the detection of structural damage and movement within the heritage bridge. The closure, initiated on March 10, is expected to last for at least three months, impacting a critical link between Sydney and western New South Wales. Geotechnical assessments are underway to determine the extent and cause of the damage, while significant traffic diversions are in effect, rerouting approximately 11,000 to 12,000 vehicles daily through alternative routes.
Closure Details and Cause
Eastbound lanes of the Great Western Highway at Victoria Pass, near Little Hartley, were initially closed on Thursday, March 7, after damage was observed in the road surface. By Sunday, March 10, all westbound lanes were also closed. Geotechnical crews identified significant issues, and monitoring confirmed movement in the road's substructure, prompting the full closure due to safety concerns.
Transport for NSW (TfNSW) has described the situation as "evolving and complex." Regional Roads and Transport Minister Jenny Aitchison stated that the closure is not a short-term repair, characterizing the situation as a major geotechnical failure on a fragile and historic road section. Engineers are investigating potential causes, including movement of the northern retaining wall or deterioration of the original crushed stone fill over time, which could be exacerbated by water.
Assessment and Repair Timeline
Specialists are currently assessing the nature of the structural failure, focusing on the bridge's fill material. Geotechnical teams are drilling into the fill and installing instruments to monitor bore water pressure and ground movement. This initial monitoring and specialist testing, including 3D imaging, is anticipated to take approximately one to two weeks, during which no traffic can pass.
Following this assessment, the government projects that repairs will require at least two additional months to make the road safe for vehicles, under optimistic scenarios. This indicates a minimum closure period of three months.
Traffic Diversions and Impact
Mitchell's Causeway, a heritage structure built by convicts in 1832, is part of a thoroughfare utilized by approximately 11,000 to 12,000 vehicles daily, including about 1,800 heavy vehicles. The closure significantly impacts truck drivers due to existing heavy vehicle restrictions in Lithgow's main street and the nature of the diversion routes.
Diversion Routes:
- Eastbound (towards Sydney): Motorists are diverted at Lithgow via Chifley Road to the Bells Line of Road or the Darling Causeway.
- Westbound (from Sydney): Traffic is detoured along the Darling Causeway at Mount Victoria to the Bells Line of Road and Chifley Road.
These alternative routes add approximately 25 minutes to journeys across the Blue Mountains, with potentially longer delays anticipated during weekends and holidays, extending up to two hours during peak periods. Roadworks are also present on the diversion routes, contributing to congestion. The Bells Line of Road is used by hundreds of trucks and has been noted for its windy bends. A tow truck has been stationed at the base of this road to assist heavy vehicles.
For individuals traveling to the Central West, Transport for NSW executive director of regional road maintenance, Alistair Lunn, recommended exploring alternative routes such as the Golden Highway or the Hume Highway near Yass to manage traffic flow.
Government Response and Support
The New South Wales government has announced several measures to mitigate the impact of the closure:
- Detour Road Upgrades: A $50 million investment has been allocated for upgrading three key detour roads: the Darling Causeway, Chifley Road, and Main Street in Lithgow. These upgrades will cover asphalt laying, road shoulder widening, and other general improvements. Work has commenced with patching on Chifley Road and additional asphalt laid on Darling Causeway.
- Public Transport Adjustments:
- Amended school and regular bus services operated by Lithgow Buslines from March 13.
- Two coaches operating 12 daily NSW TrainLink services between Bathurst and Katoomba (six in each direction) from March 13.
- Additional Sydney Train services planned between Bathurst and Mount Victoria from March 15.
- Inter-agency Response: A "whole of government response" is being developed. Emergency services maintain accessibility to local hospitals and through the impacted area via alternative routes.
NSW Roads Minister Jenny Aitchison stated the funding for detour roads is necessary to strengthen the safety, resilience, and reliability of the alternate routes, which are now carrying increased traffic volumes.
Local Impact and Community Response
Lithgow Mayor Cassandra Coleman reported an unprecedented volume of traffic rerouted through Lithgow. Residents, particularly on Mort Street, have experienced increased noise levels and difficulties accessing their driveways. Mayor Coleman has called for a non-partisan approach to finding solutions for the community, which is bearing the brunt of the traffic diversion.
Ramsay Moodie, president of the Hartley District Progress Association, reported disruptions for residents' commutes and challenges for businesses reliant on highway traffic. Some businesses, particularly in Little Hartley, have reported significant reductions in takings, with one noting a 70% decrease. Residents have also experienced increased travel times, with some school commutes extending from 10 minutes to two hours. The diversion has led to increased wear on local roads in Lithgow and concerns about higher fuel consumption.
The Lithgow District Chamber of Commerce described the detour road upgrades as a "positive first step," noting concerns about trucks using Lithgow's local roads and requesting discussions with Transport for NSW to potentially stagger truck movements. The Chamber expressed confidence that the safety works would not exacerbate traffic congestion, anticipating much of the work would be done at night.
Infrastructure Context
Previous state and federal Coalition governments had funded initial phases of a 34km road widening project between Katoomba and Lithgow, which included an 11km twin-tunnel planned beneath Victoria Pass. The Perrottet government ceased further funding for this project in 2022. In 2023, the Minns government entirely shelved the project after the Albanese government withdrew a $2 billion federal commitment, reallocating remaining funds to road maintenance in western Sydney and regional NSW. A 2.4km dual-lane road, costing $232 million, was constructed at either end of the planned tunnel route, bypassing Little Hartley but still connecting to the single-lane Victoria Pass.
Regarding future solutions, civil engineering professor Behzad Fatahi suggested a medium-term solution could involve injecting cement into empty spaces within the original structure, while a long-term solution would entail designing and constructing tunnels to bypass challenging areas. Regional Roads and Transport Minister Jenny Aitchison has stated that "nothing was off the table" regarding potential future infrastructure plans, but did not directly confirm if the tunnel plan would be reconsidered.