The Great Western Highway at Victoria Pass has been closed in both directions since March 9, 2026, after structural instability was detected in Mitchell's Causeway. The road is not expected to reopen for over a year.
Closure and Cause
The Victoria Pass section of the Great Western Highway—a primary link between Sydney and western New South Wales—was fully closed on March 9, 2026. The closure was triggered after Transport for NSW staff detected longitudinal cracking on the eastbound lanes on Thursday, March 6. By Sunday night, March 8, westbound lanes were also shut down when geotechnical crews confirmed significant issues and detected movement in the road's substructure, necessitating a full safety closure.
Mitchell's Causeway, a heritage structure built by convicts in 1832, had been in continuous use for 194 years. Geotechnical studies later revealed significant deterioration of the fill beneath the road, along with voids and gaps within the causeway's structure. Proactive monitoring that began in December 2025 had already identified cracks and bulging, indicating a risk of landslip.
Transport for NSW described the situation as "evolving and complex," and Regional Roads Minister Jenny Aitchison stated the failure was a "major geotechnical event."
Assessment and Repair Timeline
Initial assessments were expected to take approximately two weeks, with repairs projected to require at least two additional months. However, on June 26, 2026—110 days after the closure—the government announced a fundamentally different solution: a new bridge would be built over the existing causeway.
The new structure will be supported by deep piles anchored into bedrock, while the original convict-built causeway will be stabilized and preserved. Construction contractor Seymour Whyte was selected after an accelerated procurement process involving 10 submissions.
The road is now expected to reopen between April and June 2027, approximately 13 months after the closure began. The original three-month reopening estimate was abandoned after further structural issues were identified.
Traffic Diversions and Detour Routes
Motorists are being diverted via Lithgow to the Bells Line of Road and the Darling Causeway:
- Eastbound (towards Sydney): Diverted at Lithgow via Chifley Road to the Bells Line of Road or the Darling Causeway.
- Westbound: Detoured along the Darling Causeway at Mount Victoria to the Bells Line of Road and Chifley Road.
This alternative route adds approximately 25 minutes to journeys under normal conditions, with longer delays on weekends and holidays. Some commuters have reported travel times extending from 10 minutes to two hours.
Approximately 11,000 to 12,000 vehicles used the bridge daily, including about 1,800 heavy vehicles. The closure has forced hundreds of trucks onto the winding bends of the Bells Line of Road, where a tow truck has been stationed at the base to assist vehicles losing traction.
Detour Road Upgrades
On March 12, 2026, the NSW government announced a $50 million investment for upgrades to three key detour roads:
- Darling Causeway (linking the highway with Bells Line of Road)
- Chifley Road (running from Lithgow to Bell)
- Main Street in Lithgow
Work includes asphalt laying, road shoulder widening, and general improvements. Patching on Chifley Road and additional asphalt on Darling Causeway have already commenced.
Public Transport Adjustments
The NSW government announced additional public transport services for affected communities:
- March 13: Amended school and regular bus services operated by Lithgow Buslines.
- March 14: Two coaches operating 12 daily NSW TrainLink services between Bathurst and Katoomba.
- March 15: Additional Sydney Train services planned between Bathurst and Mount Victoria.
- Ongoing: Free coaches and additional bus and train services over the Blue Mountains.
Financial Support for Businesses
First Package
A $3.5 million support package included:
- $10,000 grants for small businesses in Mount Victoria, Hartley, Little Hartley, and Hartley Vale that demonstrate at least a 40% downturn.
- $15,000 for councils to boost visitor economies.
- $5,000 community event grants.
Second Package
An additional $20 million was announced, increasing individual grants from $10,000 to $25,000, and expanding eligibility to businesses in Lithgow, Oberon, and Blackheath—adding approximately 1,900 more businesses to the scheme.
Business Impact
A survey by Business NSW of 300 Central West businesses indicated that over half experienced cost increases of up to 30 percent due to falling revenue, supply chain delays, elevated fuel prices, and reduced customers. 98 percent of businesses reported being impacted, with small to medium-sized businesses, manufacturers, construction, and agricultural industries being particularly vulnerable.
Business owner Sharon Tofler of The Lolly Bug in Little Hartley described the initial $10,000 grant as "disappointing," stating it covers one week's wages.
Local Impact and Community Response
Lithgow Mayor Cassandra Coleman reported an unprecedented volume of traffic rerouted through Lithgow, with residents on Mort Street experiencing increased noise levels starting early in the morning and difficulties accessing their driveways. "My community is bearing the brunt of the traffic diversion," she said.
Ramsay Moodie, president of the Hartley District Progress Association, reported disruptions for residents' commutes and challenges for businesses reliant on highway traffic. Some school commutes have extended from 10 minutes to two hours.
The Nepean Blue Mountains Local Health District stated the closure timeline would not compromise local healthcare.
Political Response
NSW Liberals leader Kellie Sloane described "white-hot anger" in affected communities, stating businesses cannot survive another 10-plus months without meaningful support.
Nationals MP for Bathurst Paul Toole criticized the absence of a long-term vision and called for 24/7 work to expedite the project. Blue Mountains MP Trish Doyle defended the new bridge plan, stating it is "building something better."
Premier Chris Minns stated the government cannot provide a whole-of-region package, citing limited funds. Minister Aitchison rejected claims of underfunding regional roads, citing significant maintenance spending.
Engineering Analysis
Behzad Fatahi, professor of civil and geotechnical engineering at the University of Technology Sydney, described the bridge's 194-year lifespan as "phenomenal" given its original construction without modern bridge components. He described the new bridge plan as a "practical way forward" due to geotechnical challenges.
Maria Rashidi, associate professor at Western Sydney University, called the strategy a "technically sound and practical solution" that addresses geotechnical issues while preserving the historic causeway.
She said the proposed reopening date is achievable barring unforeseen ground conditions or prolonged weather delays.
Background on Infrastructure Plans
Previous state and federal Coalition governments funded initial phases of a 34-kilometer road widening project between Katoomba and Lithgow, which included an 11-kilometer twin-tunnel planned beneath Victoria Pass. In 2022, the Perrottet government ceased further funding. In 2023, the Minns government entirely shelved the project after the Albanese government withdrew a $2 billion federal commitment. Remaining funds were reallocated to road maintenance in western Sydney and regional NSW.
A 2.4-kilometer 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.