Katoomba to Lithgow - Great Western Highway Upgrade Program
Project overview
Together, the Australian and NSW Governments are investing more than $4.5 billion towards upgrading the Great Western Highway between Katoomba and Lithgow.
The Katoomba to Lithgow duplication will provide major economic and safety benefits. It will improve the connection between Central West NSW and Sydney, reduce congestion, improve resilience and freight productivity, and provide a safer and more reliable journey for thousands of residents, commuters, tourists and freight operators who travel in, around and through the Blue Mountains.

The Great Western Highway Upgrade Program is progressing, and we are currently consulting on updated concept designs for the upgrade of the Great Western Highway between the base of Mount Victoria and Coxs River Road, Little Hartley, and at the entry to the proposed Blackheath to Little Hartley tunnel portal at Blackheath.
Latest news
Dec 2022 - Medlow Bath Pedestrian Bridge Design Briefings
Transport for NSW is holding the first meeting with selected local representatives to discuss heritage values to be incorporated into the Medlow Bath Pedestrian Bridge design.
The team will be available at the below venues to discuss heritage values with the wider community:
Medlow Bath Railway Station – 4pm-7pm 14th December 2022
Potbelly at Medlow Café – 8am-11am 17th December 2022
Oct 2022 - Review of Environmental Factors (REF) consultation
Thank you to everyone who took the time to respond and make submissions to the Review of Environmental Factors (REF) consultation for the Medlow Bath and Katoomba to Blackheath (East section) upgrades.
Both the Katoomba to Blackheath (East section) and Medlow Bath upgrades have now been approved, with the Medlow Bath section to be the first section of the highway to be upgraded. The project will managed by Transport and funded by the Australian and NSW Governments.
The Submissions Reports and Community Consultation Reports for both sections are now available on the project website portals at nswroads.work/gwheast and nswroads.work/gwhmedlow
Project information and the full REFs and Submissions Reports for both the Katoomba to Blackheath (East section) and Medlow Bath can be found on the online portals.
Subscribe to project updates
We will send regular email updates to people interested in our two projects.
Email us on gwhd@transport.nsw.gov.au to be added to our subscription list or phone 1800 953 777.
Project information
Background
The Great Western Highway Upgrade Program is an infrastructure program of national importance. It will make the Blue Mountains and the Central West and Orana more attractive places to live, and will unlock the potential of regional NSW.
The NSW Government has progressively upgraded sections of the Great Western Highway to make it safer and more reliable for all road users. This upgrade will complete the final 34 km connection of a modern dual-carriageway link across the Blue Mountains.
The Great Western Highway Upgrade Program consists of:
- Medlow Bath Upgrade
An upgrade and duplication of the existing surface road corridor with intersection improvements and a new pedestrian bridge. - Katoomba to Blackheath Upgrade
Upgrade, duplication and widening of the existing surface road corridor, with connections to a tunnel portal at Blackheath. - Blackheath to Little Hartley Upgrade
Construction of a tunnel bypass of Blackheath and Mount Victoria, with portals at Blackheath and Little Hartley. - Little Hartley to Lithgow Upgrade
Upgrade, duplication and widening of the existing surface road corridor, with connections to a tunnel portal at Little Hartley. - Coxs River Road Upgrade
An upgrade and duplication of the existing surface road corridor including a road bridge at Coxs River Road.
Blackheath Co-Design Committee
The Blackheath Co-Design Committee (BCC) was formed by Transport for NSW in March 2020, following feedback from the community. The Committee included stakeholder group representatives, selected community representatives, and representatives from the Blue Mountains City Council and emergency services.
The BCC was not a decision making body, but the outcome of the BCC is an important input into the Government's decision-making process for determining a preferred route option and design as the program progresses.
The Committee's unanimously preferred option was for a long tunnel underneath Blackheath.
- View or download the report on the BCC process and findings (PDF, 12Mb), produced by independent facilitators KJA.
- View or download the BCC fact sheet (PDF, 1.95Mb).
- View the Blackheath Co-Design Committee Terms of Reference
Blackheath Co-Design Committee Meeting Minutes
View or download:
Community information
Community consultations
Great Western Highway Upgrade Program Stakeholder Engagement Strategy
Transport is committed to engaging with the community and stakeholders at all stages of the Great Western Highway Upgrade Program from early planning through to design, construction, operations and maintenance.
Read the Great Western Highway Upgrade Program Stakeholder Engagement Strategy.
Katoomba to Blackheath (East Section) Review of Environmental Factors consultation May - June 2022
The Review of Environmental Factors (REF) and Concept Design for the proposed Katoomba to Blackheath Upgrade has now closed. The REF and concept design for the Katoomba to Blackheath Upgrade was released for community consultation on 15 May 2022, with consultation continuing to 19 June 2022. The engagement included six community information sessions, which were a mixture of online and face-to-face sessions. Transport is preparing a Submissions Report summarising and providing responses to submissions received during the REF display period, which is expected to be released in late 2022. Project information and the full REF can be found on the online portal.
Little Hartley to Lithgow (West Section) Review of Environmental Factors consultation November 2021 – January 2022
The Review of Environmental Factors (REF) and concept design for the Little Hartley to Lithgow (West Section) upgrade was released for community consultation on 23 November 2021, with consultation continuing to 16 January 2022. The engagement included six community information sessions, which were a mixture of online and COVIDSafe face-to-face sessions.
Submissions have been categorised and formally responded to in the Little Hartley to Lithgow (West Section) Submissions Report. Transport has also prepared a Consultation Report summarising the community engagement carried out during the REF display period. Both reports were released on 29 June and can be viewed and downloaded from the project interactive web portal at nswroads.work/gwhwestconsult
Medlow Bath Upgrade Review of Environmental Factors consultation July – September 2021
The Review of Environmental Factors and Concept Design for the Medlow Bath Upgrade was released for community consultation on 27 July, with consultation continuing to 5 September 2021.
The engagement included six community information sessions, held online in order to comply with advice from NSW Health and Covid-19 restrictions. These sessions were attended by 146 people in total.
A number of targeted information sessions were also held with local businesses, groups and associations and a number of phone consultations were also held.
During the consultation period, we received 348 formal submissions from 250 individual members of the community, businesses and stakeholders. The Submissions Report to the Medlow Bath REF will be released when the REF is determined.
Blackheath tunnel options consultation October - November 2020
The preferred strategic route option for the bypass at Blackheath was released for consultation on 12 October 2020, focusing upon a long tunnel with various portal options. Consultation continued until 28 November. The engagement included three community information sessions, held online in order to comply with advice from NSW Health and Covid-19 restrictions. 241 people booked into the online consultation sessions, while a further 125 people watched the recorded sessions at a later date. Seven phone consultations were also held, at the request of individual residents. More than 6211 people visited the online virtual consultation portal and more than 2486 items of feedback were received by the project team. You can view or download the community consultation summary report (PDF, 5.52Mb).
Transport has conducted extensive investigations into the feasibility of a tunnel between Blackheath and Little Hartley. Investigations have confirmed that two identical (twin) tunnels, one eastbound and one westbound, around 11 kilometres long would deliver more benefits for the environment, the community and road users than two shorter tunnels beneath the villages of Blackheath and Mount Victoria.
Transport will further develop the preliminary concept design which will be used as the basis for the Environmental Impact Statement (EIS). The Department of Planning and Environment will place the EIS on display and invite community feedback in the second half of 2022.
The EIS exhibition is your opportunity to have your say on the development of the Blackheath to Little Hartley tunnel.
Medlow Bath upgrade consultation June - August 2020
The strategic design for the upgrade of the Great Western Highway through Medlow Bath was released for community consultation on 29 June, with consultation continuing to 31 August 2020. The engagement included eight community information sessions, held online in order to comply with advice from NSW Health and Covid-19 restrictions. The sessions were attended by 70 people. A number of targeted information sessions were also held with local businesses, groups and associations and a number of phone consultations were also held. More than 850 items of feedback were received by the project team.You can view or download the community consultation summary report (PDF, 3.7Mb).
Katoomba to Lithgow strategic design consultation November - December 2019
The strategic design for the upgrade of the Great Western Highway from Katoomba to Lithgow was released for community consultation on 07 November 2019, with consultation continuing to 16 December 2019. The engagement included nine community information sessions, two pop up displays and one public meeting held along the corridor at locations including Katoomba, Medlow Bath, Blackheath, Mount Victoria, Hartley and Lithgow. The sessions were attended by 1350 people and 1759 items of feedback were received by the project team. You can view or download the community consultation summary report (PDF, 18.5Mb).
Frequently asked questions (FAQs)
- March 2022 frequently asked questions
Emergency work on Great Western Highway, Mount Victoria. - October 2020 Blackheath frequently asked questions
- November 2019 Overview and strategic corridor frequently asked questions
- November 2019 Property and environment frequently asked questions
- November 2019 Freight and regional growth frequently asked questions
- November 2019 Public consultation frequently asked questions
Community notifications
- October 2022 Community update
Katoomba to Blackheath upgrade - East section community update.
May 2022 Community update
Katoomba to Blackheath upgrade - East section community update.March 2022 Medlow Bath and East REFs to be determined together
July 2021 Medlow Bath Upgrade Review of Environmental Factors community update
April 2021 Blackheath to Little Hartley long tunnel investigation community update
November 2019 Katoomba to Lithgow strategic consultation community update
Project documents
Some documents on this page may not comply with accessibility requirements (WCAG).
If you are having trouble accessing information in these documents, please contact us.
Project notifications
- March 2023 project notification (PDF, 225.67 KB)
Changed traffic conditions for night work on the Great Western Highway at River Lett Hill on Sunday, 19 March. - January 2023 project notification
January 2023 Night work on the Great Western Highway between Hartley and Lithgow on Thursday, 19 January.
September 2022 project notification
Rail building replacement work continuing at Medlow Bath – weekend work.- April 2022 project notification
Social impact assessment surveys from Blackheath to Hartley from 11 April.
March 2022 project notification
Geotechinical work on the Great Western Highway, from Blackheath to Little Hartley.March 2022 project notification
Emergency work on Great Western Highway, Mount Victoria.March 2022 project notification
Traffic management on the Great Western Highway at Mount Victoria following record rainfall.March 2022 project notification
Geotechnical investigations from Little Hartley to Lithgow from 14 March.Novemeber 2021 project notification
Field investigations in Blackheath, Mount Victoria and Little Hartley from 22 November.Novemeber 2021 project notification
Field investigations on Great Western Highway, Blackheath from Wednesday 3 November.August 2021 project notification
Field investigations in Medlow Bath from Thursday 19 August to Sunday 31 October 2021.August 2021 project notification
Geotechnical investigations in Medlow Bath from Monday 6 September 2021.August 2021 project notification
Air quality monitoring station installation in Blackheath, Mount Victoria and Little Hartley from Monday 16 August to Monday 13 September 2021.May 2021 project notification
Safety Upgrade works, Medlow Bath, from Wednesday 5 May.April 2021 project notification
Geotechnical investigation work on the Great Western Highway in Medlow Bath.March 2021 project notification
Investigation work on the Great Western Highway from Katoomba to Blackheath.March 2021 project notification
Investigation work on the Great Western Highway from Little Hartley to Lithgow.February 2021 project notification
Medlow Bath Rail corridor investigation work.January 2021 project notification
Geotechnical investigation work between Blackheath and Little Hartley.December 2020 project notification
Medlow Bath Safety Works.
Blackheath Co-Design Committee
- Consultation process and outcomes report
- Blackheath Co-Design Committee fact sheet
- Terms of Reference
- Blackheath Co-Design Committee meeting minutes
Wednesday 19 August 2020.
Blackheath Co-Design Committee meeting minutes
Wednesday 5 August 2020.Blackheath Co-Design Committee meeting minutes
Wednesday 1 July 2020.Blackheath Co-Design Committee meeting minutes
Friday 19 and Saturday 20 June 2020 (site inspections).Blackheath Co-Design Committee meeting minutes
Wednesday 3 June 2020.Blackheath Co-Design Committee meeting minutes
Wednesday 6 May 2020.
Consultation Reports
Factsheets
- August 2021 Air quality monitoring stations fact sheet
Great Western Highway Upgrade Program.
August 2021 Air quality fact sheet
Great Western Highway Upgrade Program.
Media releases
- 14 September 2022
Countdown to the start of work on Great Western Highway upgrade.
18 August 2022
Seeds for tomorrow's Great Western Highway.28 July 2022
Noise mitigation for Medlow Bath homes on the upgrade route.30 June 2022
Extra protections for River Lett Platypus population as part of Great Western Highway upgrade plans.- 15 May 2022
Great Western Highway upgrade drives jobs bonanza. - 15 May 2022
Have your say on the Katoomba to Blackheath Great Western Highway upgrade. - 15 May 2022
Australia's longest road tunnel locked in for Blue Mountains.
22 April 2022
Coxs River Road interchange to be the new gateway to the central west.22 February 2022
New approach for environmental assessment for Blue Mountains communities.13 December 2021
More time for feedback on Little Hartley to Lithgow plans.23 November 2021
Have your say on the Great Western Highway upgrade from Little Hartley to Lithgow.17 November 2021
Flora and fauna field work starts along future GWH tunnel corridor.14 September 2021
Historic Blue Mountains tunnel a step closer.31 August 2021
Preservation of Aboriginal heritage a key part of Blue Mountains Highway upgrade.27 August 2021
Medlow Bath highway design consultion extended.17 August 2021
Baseline air quality testing through Blue Mountains as part of great Western Highway upgrade.27 July 2021
Community shapes refined design for Medlow Bath Highway upgrade.14 June 2021
Great Western Highway upgrade powering ahead.14 June 2021
Safer passage through Medlow Bath ahead of full highway upgrade.4 June 2021
Archaeological dig to explore Aboriginal connection to Blue Mountains.3 May 2021
Australia’s longest road tunnel proposed for Great Western Highway Upgrade.3 March 2021
Doing the groundwork for highway upgrade.18 February 2021
Highway history to be preserved for future generations.18 December 2020
Contracts awarded for Great Western Highway upgrade works.17 December 2020
Safety drives highway upgrade at Medlow Bath.30 October 2020
More time to have your say on Blackheath tunnel.12 October 2020
Tunnel options best fit for Blackheath.1 October 2020
Heading west this long weekend? Making your journey home faster and safer.28 September 2020
Contract awarded for Great Western Highway upgrade through Medlow Bath.6 August 2020
Medlow Bath residents have more time to consider Great Western Highway design.7 June 2020
Medlow Bath residents invited to have their say on Great Western Highway design.4 June 2020
Two possible bypasses of Blackheath considered by committee.10 June 2020
Great Western Highway upgrade west of Lithgow.13 May 2020
Locals have their say on Great Western Highway upgrade.28 February 2020
Blackheath locals to help co-design Great Western Highway upgrade.3 December 2019
Blackheath community invited to meeting to learn more about the Great Western Highway upgrade.7 November 2019
Have your say on Great Western Highway.11 March 2019
Green light for $2.5 billion Great western highway duplication.
Contact us
For further information about this project, please contact:
Phone: 1800 953 777
Email:gwhd@transport.nsw.gov.au
Post: Great Western Highway Upgrade Program - PO Box 334, Parkes NSW 2870