Hoss Causeway and Tommy Swamp flood improvement work

The NSW Government is funding plans to improve flood immunity, improve safety and reduce future maintenance costs on the Oxley Highway near Carroll.

Water over the Oxley HIghway at Hoss Causeway, east of Carroll
Water over the Oxley HIghway at Hoss Causeway, east of Carroll

Updates and announcements

Roads and Maritime Services is proposing to fix or vary the road levels as part of the flood improvement work to be carried out at Hoss Causeway and Tommy Swamp as shown in these drawings (PDF, 16.5Mb).

The drawings are also available to view until Wednesday 20 June at Gunnedah Shire Council Chambers between 9am and 4pm, Monday to Friday.

The owners of land adjoining the affected parts of the road are entitled to make submissions to Roads and Maritime in response to the proposals. Any submissions should be made in writing before Wednesday 20 June to:


Each day almost 4000 motorists travel along the Oxley Highway between Gunnedah and Tamworth.

When it rains, localised flooding of the Hoss Causeway (immediately east of Carroll) and Tommy Swamp (about seven kilometres west of Carroll) as well as possible overflow from the Namoi River, can result in the temporary closure of the Oxley Highway, causing lengthy delays for motorists.

The project

Roads and Maritime is proposing to upgrade the road to minimise water flowing across the Oxley Highway.

The upgrade will involve raising the road level and installing new drainage at Hoss Causeway and Tommy Swamp on the Oxley Highway. We are also proposing to raise the road level on Gunnembene Lane.

These measures will allow the highway to remain open in flood events (up to one in five year interval floods).

The key benefits of the project are to:

  • Increase the flood immunity at the Hoss Causeway and Tommy Swamp to one in five year year standard
  • Reduce the frequency of the Oxley Highway being cut by floodwater
  • Improve safety by removing the dip at Tommys Swamp
  • Minimise future maintenance requirements.

What happens next

Work on the project will start following the completion of community consultation, environmental assessment and detailed design. Feedback received from the community will be considered in finalising the design.

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