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Sarina Range reconstruction project

Overview:

The Sarina Range is located on Marlborough-Sarina Road approximately 13-16km south-west of Sarina.

Marlborough-Sarina Road has relatively low traffic counts, however a large number of rural properties and local communities are located in the area. 

The high intensity rainfall from Severe Tropical Cyclone Debbie caused a number of landslips and large cracks along the range crossing.  

The 2 major slips were approximately 300m in length and had significant areas of geotechnical failure. One of the major slips included complete loss of the road and supporting embankment.

The road has recently reached practical completion and is open to traffic with no restrictions in place. 

Location:

The key project reconstruction sites were located on Marlborough–Sarina Road along the Sarina Range.

Completion:

The project is now complete.

Benefits:

This NDRRA project is focused on rebuilding Marlborough–Sarina Road across the Sarina Range, reconnecting communities and restoring safe and efficient travel routes for all motorists.

Funding:

Eligible reconstruction works are jointly funded by the Commonwealth and Queensland Government under the Natural Disaster Relief and Recovery Arrangements (NDRRA).

Regions:
Central Region - Mackay Whitsunday District

Project info

Marlborough-Sarina Road, (Sarina Range), has reached completion after response 21 months of restoration works to repair damage as a result of the rainfall associated with Severe Tropical Cyclone Debbie in March 2017.

The final works associated with the roadway restoration were completed in December and included drainage, completion of bitumen and asphalt sealing and rehabilitation works, installation of guard rails, line marking and revegetation.

There are some additional tasks that will be completed in January, however these are not on the roadway and involve restoration and revegetation of areas that were used to assist the restoration project.

The project team was a large multidisciplinary group who all worked to ensure the project was completed as soon as possible and represented the best value for money for the people of Queensland.

Fast facts—Marlborough-Sarina Road restoration project

The Marlborough-Sarina Road (Sarina Range) Restoration project was based on robust engineering solutions to catastrophic roadway failures and included several treatments to effectively restore the roadway. 

One lane of the road was reopened on 8 October 2018 under traffic control and the restoration project reached completion on 21 December 2018. 

  • Over 10,500 dump trucks full of land slip and excavated material was removed from the damaged sites to facilitate the reconstruction of the roadway. 

  • By the end of the project, around 40,000 square metres of revegetation will be introduced to stabilise embankments and restore areas that were cleared to assist with the reconstruction project. That's the equivalent of 6 international standard football fields. 

  • Over 50,000 litres of grout was used as part of the slope stabilisation process along the land slip sites. That's the equivalent of 3500 x 20kg cement bags. 

  • Around 5km of soil nails were introduced to the slopes for stabilisation and worker safety. That's around the same distance from Colston Park community hall to the Sarina Range. 

  • The retaining wall at the main slip site was made from 7000 blocks. If you were to lay these blocks end to end, they would stretch the entire Sarina Range crossing. 

Fast facts—Koumala-Bolingbroke Road detour route and safety upgrade project

Koumala-Bolingbroke Road was the designated detour route while Marlborough-Sarina Road was closed to traffic along the Sarina Range. Due to the increase in traffic, the road conditions and range crossing, 24-hour traffic control was introduced in mid-2017 to guide vehicles safely over the range crossing and funding was allocated to provide vital safety upgrades to the road. 

  • As part of the safety upgrade, over 370 new guide posts have been installed along the upgraded sections of road. Laid end to end, that's almost as high as Pine Mountain. 

  • Around 2km of guard rail was installed along the Koumala-Range to increase safety on the crossing. 

  • Around 4.3km of road was upgraded and bitumen sealed, including the entire Koumala Range crossing. In total, there is now over 12km of bitumen seal from the Bruce Highway to the western side of the Koumala Range. 

  • In total, around 850 tonnes of cement were used to stabilise the upgraded section of the road. The cement is mixed in with road base and equalled over 60 cement trucks. 

  • The traffic control guide vehicle travelled at least 100,000km while assisting motorists to cross the Koumala Range safely when it was a detour route. That's the equivalent of over 7 trips around Australia using the National Highway network!

 

Community info

If you have any questions or concerns please contact us:

Email: mackay.office@tmr.qld.gov.au
Phone: 07 4951 8555
Post: Sarina Range Reconstruction Project
Department of Transport and Main Roads
PO Box 62
Mackay Qld 4740

Media gallery

Before works

Damage sustained to Marlborough-Sarina Road along the Sarina Range as a result of Severe Tropical Cyclone Debbie in 2017.

Damage sustained to Marlborough-Sarina Road along the Sarina Range as a result of STC Debbie in 2017.

Damage sustained to Marlborough-Sarina Road along the Sarina Range as a result of STC Debbie in 2017.

Damage sustained to Marlborough-Sarina Road along the Sarina Range as a result of STC Debbie in 2017.

Damage sustained to Marlborough-Sarina Road along the Sarina Range as a result of STC Debbie in 2017.

Damage sustained to Marlborough-Sarina Road along the Sarina Range as a result of STC Debbie in 2017.

Damage sustained to Marlborough-Sarina Road along the Sarina Range as a result of STC Debbie in 2017. 

Clearing works and establishment of a machinery track under the major landslip on the Sarina Range.
Clearing works and establishment of a machinery track under the major landslip on the Sarina Range.

Soil nailing is now complete on the upslope.
Site 8: soil nailing is now complete on the upslope.

Preparing to lay mesh on the upslope.
Site 8: preparing to lay mesh on the upslope.

Mesh installation is now complete on the upslope.
Site 8: mesh installation is now complete on the upslope.

Excavation and soil nailing continues on the main slip site.
Site 8: excavation and soil nailing is now complete on the main slip site.

Preparing to add new material to stabilise the embankment.
Site 21 and 22: preparing to add new material to stabilise the embankment.

Material was added to stabilise the embankment – Site 21 and 22 are now complete.
Site 21 and 22: material was added to stabilise the embankment – Site 21 and 22 are now complete.

Site 8 down slope-works on the key trench and preparation for the block retaining wall continue
Site 8: works on the key trench and preparation for the block retaining wall continue. 

Aerial imagery of the reconstruction sites taken in May 2018
Sites 8, 9 and 10: Aerial imagery of the reconstruction sites taken in May 2018.

Sites 8, 9 and 10 taken September 2018
Site 8, 9 and 10: Aerial imagery of the reconstruction sites taken in September 2018.

Construction of block retaining wall site
Site 8: Construction of the block retaining wall at the main slip site (Site 8).

Site 8: The block retaining wall at the main slip site is now complete.
Site 8: The block retaining wall at the main slip site is now complete.

Marlborough-Sarina Road was successfully reopened under traffic control on 8 October 2018
Marlborough-Sarina Road was successfully reopened under traffic control on 8 October 2018 

A board showing the history of landslides along the Sarina Range
A history board displaying information on previous landslides on the Sarina Range

Videos of reconstruction work

Video of time-lapse footage showing construction of the key trench construction at site 8 (main slip down slope).

 

Video of time-lapse footage showing excavation of the roadway at site 8 (main slip).

 

Video of drone footage showing progress (captured March 2018).

 

Last updated
28 February 2019