Major Repair Works at Back Creek, Burragorang Road

Back Creek Road Works

Torrential rain during February caused havoc across the Wollondilly Shire, with crews working tirelessly to repair damage to the road network to make it safe for drivers.

Back Creek at Burragorang Rd, Belimbla Park has major damage, with the culvert and road washed away by the enormous quantity of stormwater which ran down the creek. Trees upstream were also dislodged by the strength of the water flow.

Updates 

Work has progressed as planned at Burragorang Rd, Back Creek and will reopen to traffic on 17 July. Work to improve the embankment will then start on 18 July with traffic control in place as required, but the road remaining open. 

 

Photo 1 – Guardrail Foundation prepared and ready for concrete

Burragorang update

Photo 2 – New Road is installed, road furniture and linemarking outstanding

update 3

 

Planned Works

Design for the permanent reconstruction of the road is already under way and has been given the highest priority in the long list of repairs to be carried out across the Shire.

See tables below for full timeline:

Phase 1- Restore Essential Services

Status

Timeframe

Temporary Sydney Water Sewer and Water Repairs

Complete

 

 

 

Permanent Sydney Water Sewer and Water Repairs

Complete

 

Phase 2- Design and Tender

Status

Timeframe

Design

Complete

 

 

 

 

 

 

4 Weeks

Engineering Survey

Complete

Geotechnical Assessment

Complete

Flood Modelling

Complete

Structural Design

Complete

Drafting of Final Design

Complete

Tendering

Complete

Issue Expressions of Interest (EOI)

Complete

Site Visit and Inspection by Contractors

Complete

Shortlisting of EOI's

Complete

Issue of Tender Documentation to Contractors

Complete

Review Submissions and Award Construction Contract

Complete 

 

Phase 3- Construction

Status

Timeframe

Early Works- Clean up and Install Environmental Controls

Complete

 

 

 

 

 

 

12 Weeks

Procurement of Long Lead Time Items

Complete 

Contractor Establishment

Complete

Install New Culverts and Headwalls

Complete 

Bulk Earthworks- Fill

Complete

Detail Earthworks and Embankment Protection

Complete

Road Pavement, Guardrail and Road Furniture

June 2020

Open Road to Traffic

17 July 2020

 

Phase 4- Site Improvements

Status

Timeframe

Access for Mainteance, Revegetation etc

17 July 2020

 6 Weeks

 

Diversions

Diversions are in place for light vehicles along Binalong Rd and Russell Lane and Council will be monitoring the alternate route and carrying out repairs as required.

Council is working to provide alternative access for heavy vehicles along Montpelier Dr and Barkers Lodge Rd. 

Light Vehicle Detour Map

 Detour Map Burragorang Rd

Light vehicle detour route (8T load limit applies) via Binalong Road and Russell Lane, then a right turn onto Barkers Lodge Road to access Oakdale and Nattai.

Heavy Vehicle Detour Map

Heavy vehicle detour

The 15T load limit has temporarily been removed from Montpelier Drive to assist with access to Oakdale and Nattai in response to the road closure on Burragorang Road. The Heavy Vehicle National Law (HVNL) requires that certain classes of heavy vehicles (restricted access vehicles) may only be used on a public road if the operator has granted access through a notice of permit (mass or dimension authority) from the National Heavy Vehicle Regulator (NHVR). 

Detour route for vehicles over 8T and under 42.5T (General Access only) via John Street/Montpelier Drive at The Oaks and then a right turn onto Barkers Lodge road for access to Oakdale and Nattai.

More information about heavy vehicles can be found here.

Frequently Asked Questions

This particular redesign includes specialist input from flood, geotechnical, structural and road engineers, supported by surveyors, environmental consultants, drafts people and project managers.The design allows for one in one hundred year flood resilience and will be built to hold up to future storm events.

Council has awarded the reconstruction work to Western Earthmoving.

Back Creek had not seen significant water flow for over two years. The accumulation of leaf litter, dead shrubs and trees due to the drought resulted in a significant amount of material floating downstream to the road culvert in the rain event. This material blocked the normal flow of the creek including the culvert, which meant the embankment was eroded and water built up behind the embankment. Under this pressure, the already weakened embankment failed and collapsed into the creek.

Designs are engineered to the standards of the time. The existing culverts at Burragorang Rd were constructed to standards that were in place around 45 years ago. To make sure that reconstruction has the capacity to cope with a flood event in the future, we need to confirm and check all of the design parameters. This particular redesign includes specialist input from flood, geotechnical, structural and road engineers, supported by surveyors, environmental consultants, drafts people and project managers.

While preparations for reconstructing the culvert continue, Council is simultaneously investigating the feasibility of constructing a bridge. However, this will likely take up to two years and cost millions of dollars more, delaying the opening of the road for residents and taking away funding to repair the extensive storm damage across the road network.  A bridge will not meet the immediate community need to reopen the road as soon as possible.

This project would not have been possible without the assistance provided to Wollondilly Shire Council through the jointly funded Commonwealth-State Disaster Recovery Funding Arrangements (DRFA)

At this time we estimate the entire project will cost approximately $1.2 million.

We expect the road to be re-opened in July 2020. Regular updates will be available on this page.