Mount Spec Road Reconstruction Update

Reconstruction works are progressing along Mount Spec Road, and there are 35 damaged sites identified along the route.

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Over the past month, you may have noticed crews working on steep sections of the road, including specialists abseiling down damaged upslopes to carry out reconstruction works. Here's what’s happening at each location as works move through the reconstruction phase to restore the road to its pre-event function.

Upslope site 15 (U15) - Formerly known as high-risk site 7 - Workers have been removing loose rocks from the slope in preparation for reconstruction works.

A temporary three-layer shipping-container wall has been installed to maintain safety for road users while permanent reconstruction works are completed. We installed 27 large shipping containers each one weighing about 3.15 tonnes: that’s 85 tonnes of steel in total.

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Together, they provide just under 600 cubic metres of capacity. The containers were filled with about 1,070 tonnes of a sand and aggregate mix - that's the equivalent of almost 400 Landcruiser wagon's worth of material delivered and installed on site.  

Upslope site 1 (U1) - Similar to a number of sites, at U1, Geobinder, an eco-friendly natural binder, has been sprayed onto the slope to minimise erosion risk until reconstruction works are completed. This site also has a heritage listed stone kerb and channel for directing water runoff. To protect this important asset, a timber protection is installed first to safeguard the stonework prior to the installation of the Geobinder.

Upslope site 2 (U2) - Workers have installed passive fixing dowels to help stabilise the slope. During the past fortnight, crews have drilled holes into the slope, secured steel rods in place with grout (a strong concrete-like material), and have installed weep holes to help release built-up water to reduce pore pressure behind the slope repair.        

Upslope site 7 (U7) - Workers have been removing loose rocks from the slope in preparation for reconstruction works. Environmental controls are in place to protect the surrounding environment during the works.

Specialist equipment (depth gauges) has been installed to ensure correct depths are achieved when passive fixing dowels are installed.

These steps are all part of the preparation for the next stage, where a protective concrete layer using Fibre Crete will be sprayed onto the surface.

Upslope site 8 (U8) - Workers have been removing loose rocks from the slope in preparation for reconstruction works.

Workers have been abseiling down the slope to carry out the next stage. They are installing passive fixing dowels, which are strong steel rods placed deep into the rock to help hold it securely in place. To do this, they drill holes into the rock and fill them with grout, a strong concrete-like material that locks the steel rods in position and helps stabilise the slope.      

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Prepare for unplanned road closures

During the wet season there may be heavy rainfall in the Paluma area which could result in unplanned road closures on Mount Spec Road for safety.  Please plan ahead.  

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Vehicle escort service

Daytime vehicle escort service from 6am to 6pm for approved permit holders. Runs hourly on the hour, for example, 7am, 8am and so on. Final service at 6pm, up and down. Two vehicle escorts operate simultaneously at both gates. Bookings not required.

Nighttime vehicle escort service from 6pm to 6am for exceptional circumstances such as work commitments. Pre-arranged bookings are required, please contact  engagement.northern@tmr.qld.gov.au to arrange.

Night works may impact nighttime vehicle escorts. Advance warning will be provided to stakeholders.

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Emergency access

TMR has an emergency access process in place during the scheduled road closure period, between 6pm and 6am. In the case of an emergency, please call 000. Traffic controllers are stationed at the top and bottom gates 24/7.

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Contributed with thanks by Department of Transport and Main Roads Queensland

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