Mt Keira Road
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Mt Keira Road

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Road work completed November 2014

Work on this major project has now been completed, with the final asphalt surface and line marking of Mount Keira Road finished in late October 2014.

A community celebration was held on Saturday 8 November 2014, with a free walk from Mount Keira Demonstration School to the summit.

Background

Council has been monitoring the status of Mt Keira Road and undertaking planned repair and stabilisations works for many years as well as undertaking geotechnical investigations since 1998.

In the past four years Council has spent $1.75 million on repair, reconstruction and slope and cliff stabilisation works.

The 1998 geotechnical investigations identified rock fall and landslide hazards on various sections of Mt Keira Road. These are shown on this map.

PDF icon Mt Keira Road Map of Works

Council has been addressing each of these hazards by repairing areas listed as high priority. For a timeline of investigations and repairs, please see below.

During the first half of 2012, council worked on drainage and road stabilisation in the Landslide Priority 2 area.  This work was necessary due to the slow moving but persistent landslides.  They had given the road a roller coaster ride below the hair pin bend to the archery range - see Photo No1.  During these works Council was able to carry out the work while keeping a lane of traffic open.

Starting in November 2012 Council closed Mt Keira Road between the archery and the hairpin turn and partially closed the road between the hairpin and Queen Elizabeth Drive to carry out the Landslide Priority 3 remediation works.  This included replacing the pipe crossings which had failed because of the landslide. 

While Mt Keira Road was closed for these works, our geotechnical consultants were engaged to update the investigation report and risk assessment of the next area of work: the site of Landside Priority 4 and Rock Fall priority 3, immediately up hill of the works site.

The investigations of the land slide and rock fall area of Mt Keira Road revealed that the sites had deteriorated significantly such that the risk to public safety had become unacceptable due to a combination of hazards from falling rocks, landslides and a large increase in the cross fall  of the road. See photos below.

Based on the unacceptable risk to the travelling public it was necessary keep the road closed and Council has installed warning signs and blockades to keep people away from the hazardous areas of the road.

Council acknowledges that Mt Keira Road is popular with walkers and all types of cyclists; however, ensuring the community is safe from rock falls and landslides is a top priority and residents are asked to abide by the road closure for their own safety.

Council’s geotechnical consultant provided a full report on the area of Landslide Priority 4 and Rock fall Priority 3 that updated information for the next stage of the remediation works and the estimated associated costs.  This advice was the subject of a report to Council for the allocation of a budget for future works.

This full report also provided advice on the possibility and risks for partially opening Mt Keira Rd for cyclists and pedestrians.

Timeline

  • July 1998: Commissioned rock fall risk assessment.
  • November 1998: Rock fall risk assessment received. 
  • October 2000: Priority 1 rock fall hazard remediated.
  • December 2000: Landslide risk assessment completed in-house.  Four sites identified requiring remediation.
  • November 2002: Priority 2 rock fall hazard remediated.  Priority 3 hazard assessed as at Tolerable risk.
  • June 2008: Field work commenced for detailed assessment of landslide hazards.
  • June 2010: Detailed designs for landslide remediation complete.
  • September 2010: Minor rock falls in Priority 3 rock fall hazard area.
  • 2011-2012 Budget provision to remediate Priority 1 landslide hazard and to start Priority 2 hazard.
  • April 2011: Commissioned updated rock fall risk assessment.
  • May 2012: Updated rock fall risk assessment received.
  • 2012-2013 Budget provision to complete remediation of Priority 2 landslide hazard as well as Priority 3 hazard.
  • November 2012:  During the road closure for Priority 2 and 3 landslide remediation, consultant recalled to review the rock fall risk assessment report and to commence a scoping exercise for the design of the Priority 3 rock fall hazard remediation.  During this work a significant increase in the road camber due to movement of landslide hazard No 4 was noticed.  Assessed to be an unacceptable hazard.  Considered reducing road to single lane to avoid this hazard but that in turn doubled the rock fall risk elevating it to unacceptable risk.
  • December 2012: Decision made to keep Mt Keira Pass closed following completion of the Stage 3 landslide remediation works due to the combination of rock fall and landslide hazards at sites 3 and 4 respectively.
  • March 2013: Council resolved Mt Keira Road remain closed to general traffic until required remediation works are completed and the risk to the public is reduced to at least tolerable.
  • July 2013: Council received the concept designs for geotechnical stablisation works and started working on approval for the work from various government bodies including the National Parks and Wildlife Service. It’s anticipated Council will go to tender for the project in the coming months.
  • October 2014: Priority 4 geotechnical stabilisation and road reconstruction works completed at cost of $2.5 million.  

 

  

Photo 1: Shows how the landslide below the hairpin bend had turned the road into a roller coaster. Landslide remediation works priority No 3 were completed along this section of road just before Christmas 2012. Works in landslide areas 1 and 2 had been completed earlier.

 

Photo 2: shows a minor rock fall in the rock fall priority 3 area which occurred in September 2010. The remediation of rock fall hazard areas 1 and 2 were completed in 2000 and 2002 respectively.

 

 
Photo 3: illustrates the increase in road camber in Landslide No 147 below the rock fall hazard area.  The drill rig was being used to assess the subsurface ground conditions which have caused the increasing camber.  Compare the drill rig which is set vertical for testing to the truck which rests on the cross fall slope of the road.

 

 
Photo 4: shows a high reach platform used by the specialist consultant to review his risk assessment of the cliff face by utilising traffic control measures in place for the landslide priority 2 and 3 remediation works.

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