Restoring access - Araluen Road
Araluen Road begins on the outskirts of Moruya, loosely follows the Deua River through mountainous forest and leads to Araluen and then Braidwood. The narrow, mostly unsealed road is the main access route for properties in the Deua River Valley and Merricumbene.
The 2019/2020 summer bushfires and seven natural disaster floods and storms that followed caused damage on an unprecedented scale and significantly affected the Araluen Road community.
Along with personal, property and environmental impacts, residents have also had to deal with access issues caused by damage to the Council-maintained road network.
Bridges have been destroyed, the road surface has suffered, fire-affected roadside trees present a danger, and multiple roadside slopes have collapsed.
Council has dedicated significant resources to restoring safe access along Araluen Road and has advocated for funding through the NSW and Australian governments' Natural Disaster Relief and Recovery Arrangements.
The challenges are many, but we are focused on restoring safe access as soon as possible with the aim to provide improved resilience into the future. Additional resources have been engaged to tackle the large volume of work required.
The drought followed by bushfire and high rainfall has caused serious damage to the roadside slopes along Araluen Road. Extensive tension cracking and slope movement on both the upper and lower slopes is apparent in many areas.
The locations of the landslides and tension cracking are within mountainous riverside terrain with very steep up and downhill slopes. Instability on both the high and low sides of the road means we cannot simply clear the road of the debris.
We identified numerous sites requiring treatment as a result of the natural disasters. While we have cleared many, others require more specialist extensive investigation.
11km and 14km from Moruya
We have been scoping out the restoration works required at these smaller landslips and have begun discussions with Transport for NSW on funding under the Natural Disaster Relief and Recovery Arrangements (NDRRA).
We plan to excavate into the bank on the high side of the road at both sites in combination with stabilisation works on the downhill slopes. The completed work will provide more stable road platforms and greater width, making it safer for vehicles to pass. The fill from the excavation work will be recycled and placed along the road closer to Moruya to further improve road safety.
The excavation work is scheduled to begin in October 2021 with the completion of the down slope batter stabilisation scheduled for late in 2021 (subject to contractor availability).
19km from Moruya
This landslide is located on a particularly narrow section of road where the low side of the road is collapsing. If this section of roadway were to suffer further damage, access beyond this point would become problematic. Therefore, this location was given priority.
Contractors have undertaken roadside stabilisation works to reduce the risk of further collapse. The completed works are providing a safer, more resilient road.
Work involved drilling soil nails on the low side of the road to secure the slopes.
The collapsing roadside had left the guardrail hanging alongside the road.
Concreting of the batter face has helped to stabilise the roadside slope.
Other works for this site include:
- removing trees to make the roadway and worksite safe
- earthworks to widen the road on the cut side
- restoring the road surface and protective fencing (which became suspended due to the ground below having slipped away).
22km from Moruya, east of Knowles Creek
A large landslip in November 2020 resulted in a complete blockage of the road. Further material came down during the March 2021 floods and other landslides have since occurred nearby.
This major landslide site presents significant challenges due to the unstable rock face and further movement along this stretch of road. Simply clearing the road is not an option as the risk of further landslides is unacceptably high.
Geotechnical coring immediately above and behind the landslide shows highly fractured and unstable materials that would prove difficult to stabilise sufficiently to ensure recovery of a safe route along the existing Araluen Road.
We have successfully negotiated an agreement and funding to construct an alternate route around the landslide rather than repairing the existing road. The NSW and Australian governments are providing $3 million through the Natural Disaster Relief and Recovery Arrangements allowing us to create a safer and more resilient solution for the community for the future.
Work began on the construction of the new road on 5 July 2021 and we aim to have it open by Christmas. We’re hoping to allow resident traffic through the construction work site by November 2021 when the bulk of the earthworks are done.
These dates are subject to reasonable weather and no other significant challenges being identified during construction that would delay the project such as striking hard rock or discovery of artefacts.
A dozer and scraper are making solid progress with the earthworks needed for the new road. Most of the road drainage work is complete with pipe crossings and catchment drains in place by the start of September.
As work progresses so does our remediation of the area; the old road has been covered in topsoil and spray seeded with a native grass mix in time for the favourable spring weather.
Araluen Road remains closed to through traffic at the landslide site, however residents are able to access their property via a detour using Mount Wandera. A 5t load limit is in place on this detour route.
43km from Moruya, near Pigeon Gully
The landslide at this site is highly complex, with extensive longitudinal failures and steep mountainous slopes on both sides of the road.
Longitudinal cracking on the low side means the road is collapsing over a length of several hundred metres, dropping steeply toward the Deua River.
Since the upslope landslide occurred during the May 2021 flood, access along Araluen Road west of this location is only available from Braidwood. Access to Araluen Road east of this landslide is now only available from Moruya using the detour road around the Knowles Creek landslide.
Drone footage at this site shows the landslide is much more significant than first thought. A large slip circle failure has developed well above the road, with a huge volume of material having moved partially down the hill. The drone pictures also confirm the extensive tree death at this location, which is problematic in terms of sequencing any recovery works.
The challenges of this site require a careful and systematic approach, backed by specialist advice, to ensure the safety of workers on-site. A geotechnical specialist is preparing a systematic sequence of works to mitigate risk to the public and ensure the safety of the workers who will undertake the work.
We have undertaken initial assessments of the extensive work required to re-open the road in a safe manner. We are also investigating the possibility of building a public road around the landslide.
NSW Public Works Advisory (PWA) has been engaged to investigate the options. PWA has called for quotes from suitable consultants to undertake the geotechnical and design investigations. A consultant is expected to be appointed in September 2021.
The road will remain closed at this point for the foreseeable future.
Four timber bridges along Araluen Road have been damaged or destroyed by recent natural disasters. The NSW and Australian Governments have provided financial assistance through the National Disaster Recovery and Relief Arrangements to restore safe access.
- Pigeon Gully Bridge was rebuilt in the first half of 2020 using concrete box culverts after it was destroyed during the Black Summer fires.
- The fires also damaged McGregors Creek Bridge and Kennys Creek Bridge. Temporary structural repairs were quickly undertaken to keep the road open. The long-term solution is to provided more resilient structures using the InQuik Bridging System. The rebuilds were scheduled for late 2020 but have been setback by access problems caused by the landslides. We hope to rebuild the two bridges in early 2022. The temporary repairs to these bridges provide for safe passage in the meantime.
- Bradbuys Bridge was damaged beyond repair during winter 2020 floods. Barriers and a reduced speed limit helped keep the road open until the bridge was replaced in early 2021.
- To follow the progress of individual bridges visit Restoring access – Northern bridges
To further assist with access to Araluen Road properties we replaced Codys Bridge on Larrys Mountain Road by providing an alternative route in the event of an emergency.
By rebuilding more resilient structures our roads are more likely to withstand future flood and fire events.
Immediately after the fires our crews inspected and removed hazardous burnt and fallen trees to re-open Araluen Road and reduce the risk to road users.
While regrowth on other trees was initially encouraging, the stress of the prior drought coupled with bushfire has resulted in a secondary wave of tree death.
Specialist tree arborists assessments are required to determine which trees need to be removed to keep commuters safe. We have engaged a tree crew to selectively remove the dangerous trees. The majority of work is complete between Moruya and Knowles Creek and the crew is now focusing on the section beyond the landslide.
Also of concern is the extensive emergence of wattle seedlings along the roadsides, creating a dense thicket. We have undertaken roadside spraying in key locations to reduce wattle growth and increase line of site for road users. We plan to spray the roadsides of the full length of Araluen Road.
Our teams are working to deal with both of these issues in a way that leaves our roadsides safer for road users and more resilient in future natural disasters.
We are using funding from the NSW and Australian Governments under the National Disaster Recovery and Relief Arrangements for the tree work.
The road surface of Araluen Road has deteriorated significantly during the natural disasters. Initial damage was caused by an increase in heavy vehicles used in the fires and recovery efforts. Further damage occurred when flooding rains caused a significant loss of road material in many areas.
To help restore a suitable road surface we are undertaking additional gravel resheeting works and maintenance grading, restoring damaged drains and reshaping road edges. Timing of works are subject to the restoration of access for heavy vehicles and availability of access for plant.
We have substantially improved road safety along the detour route provided for residents around the first landslide by grading and gravel resheeting the roads. Our teams regularly inspect the condition of the roads to ensure the route is suitable for traffic, particularly during and after wet weather events. If however, residents notice any significant changes to the road, please let us know as soon as possible.
Araluen Road is closed to vehicles, cyclists and pedestrians. Residents, property owners and their visitors can use the road when needed although restrictions are in place.
Following further damage to the road during the March 2021 flood, initial clean-up works and geotechnical advice, we have implemented 5t load limits in two locations:
- On the temporary detour via Mount Wandera and Araluen Road beyond Knowles Creek
- From the landslide approximately 19km from Moruya to the major landslide east of Knowles Creek
These load limits are signposted along the roadway.
If residents need access for loads exceeding the limit please contact our Natural Disaster Recovery Administration Officer, Tracie Parsons on 4474 1224 and provide the following information:
- Type of load (eg load of timber for rebuilding, load of fruit to get to market)
- Transport company (name, phone, number)
- Weight of load and truck
- Desired dates and time(s) of travel
We will aim to arrange conditional approval for heavy loads where possible, and are happy to assist by liaising with transport companies.
Eurobodalla Shire Councillors have agreed to allocate funding under the Local Roads and Community Infrastructure Program to undertake the following resilience improvement works on Araluen Road.
Merricumbene road widening
The road immediately west of Merricumbene valley (approximately at the 38-39km mark) will be widened to move part of the road back into more solid ground. This work will also increase the road width and improve safety of passing vehicles. The excavated material will be used to fill and widen other sites along the road between Kennys Creek Bridge and the 43km mark to improve safety. These works will be undertaken by Council’s own work crews and are scheduled to be finished before Christmas.
Drainage upgrades will be provided between the 33-39km mark with additional culverts being added and some being extended to reduce stormwater damage in rain events. Some of these sites will receive fill excavated from the Merricumbene road widening as part of an integrated program of works. The large culvert, approximately at the 31km mark, will also be replaced with a new reinforced concrete pipe. A temporary side track will be established so access is maintained during works. These works will be undertaken by Council’s own crews and are scheduled to be complete by Christmas.
Batter resilience and safety improvements
Minor works will be undertaken to reduce the risk of landslips from larger batters along Araluen Road. This work will include removal of some vegetation to reduce the risk of failures due to tree roots “jacking” the rock face off the batter.
For more information about the Araluen Road work, please contact our Works Manager, Tony Swallow:
- T: 02 4474 1369
- E: Council