Flood Recovery

​Background of the event

A series of rainfall events that occurred across the State during February 2017 caused wide-spread flooding to the Great Southern Region.

That series of events was considered to be a declared event in late February 2017. The preliminary estimate of damages to State government assets is $26.5 million. Over 60 per cent of WA’s oldest road network in this region sustained damage.

We undertook immediate temporary restoration works on sections of the network that were closed or impassable. Network connectivity was completed in March 2017 with the establishment of a side-track around the Phillips River Bridge which was washed away. The side-track is operating under speed restrictions, which will stay in place until the new Bridge is built.

South Coast Highway is now open near Bedford Harbour Road. Work crews have built up causeways over the water, lifting the road above the flood ways, to avoid further road closures in the event of future storms. Works are continuing throughout the region’s road network, and recovery from this flood event is expected to take over a year.

 

General damage caused

The region’s east was impacted the most from the events and included the following major damage:

  • Phillips River Bridge (572A) and approaches on South Coast Highway were destroyed
  • East approach on the Jerdacuttup Bridge (566) on South Coast Highway destroyed
  • Warperup Bridge (547) Albany Lake Grace Road scouring of abutments
  • Bandalup Creek South Coast Highway road washed away
  • Gnowangerup Creek Bridge (599) Broomehill Jerramungup Road scouring of abutments
  • Over 320 km combination of shoulder and drainage damage
  • 270+ blocked culverts
  • Estimated $1.5 million damage to culvert/drainage infrastructure
  • Estimated $1.5 million damage to road pavement infrastructure

 

Current situation and planned works

In establishing permanent restoration works on damaged sections of the network, the following works have been undertaken:

Phillips River Bridge on South Coast Highway

  • Sidetrack and river crossing constructed using twelve 900 mm steel culverts valued at $800,000
  • Survey completed of river and road damage completed
  • Design of the replacement structure 85 per cent completed
  • Ministerial approval to undertake restoration works, valued at $8 million has been approved
  • Design of bridge structural elements complete
  • Manufacture of structural bridge elements commenced with approximately six of twelve beams cast to date
  • Bridge works commenced
  • Road design tie-in 85 per cent complete
  • Construction of the road approaches is scheduled to commence September 2017
  • Bridge scheduled to be opened to traffic in December 2017

Jerdacuttup Bridge on South Coast Highway

  • Survey completed
  • Environmental and Heritage approvals obtained
  • Side-track design commenced
  • Abutment replacement design commenced
  • Side-track construction scheduled for November 2017
  • Bridge Approach slab replacement scheduled for December 2017

Warperup Bridge on Chester Pass Road (Albany Lake Grace Road)

  • Scour rectification works commenced 
  • Works scheduled to be completed by November 2017

Bandalup Creek on South Coast Highway

  • Embankment and pavement repaired and temporarily sealed for opening.
  • Pavement to be reworked and sealed.
  • Culvert outlet headwall/apron/wing-walls to be repaired.

Gnowangerup Creek Bridge on Broomehill Jerramungup Road

  • Scour to the abutments scheduled for repairs January 2018

Shoulder and Drainage damage

  • Contracts have been awarded for 151 km reinstatement - 60 per cent completed ($5 million)
  • Contracts been finalised prior to tender for 170 km ($7 million)

Pavement Damage

  • Contracts have been finalised prior to tender ($1.5 million)
  • Bedford Harbour Causeway reinstatement design underway. (Est. $2.5 million)

Drainage Infrastructure Damage

Contracts been finalised prior to tender ($1.5 million)

 

Photos

Image: Flood recovery 1 thumbnail image.JPGImage: Flood recovery 5 thumbnail image.JPGImage: Flood recovery 2 thumbnail image.JPGImage: Flood recovery 4 thumbnail image.JPGImage: Flood recovery 3 thumbnail image.JPG
Image: Flood recovery image - Rock surface beneath pier 5 thumbnail.JPGImage: Flood recovery image - View of site 18 Aug thumbnail.JPGImage: Flood recovery image - A2 Finished thumbnail.JPGImage: Flood recovery image - Placement of concrete in Abutment thumbnail.JPGImage: Flood recovery image - Placement of reinforcement in Pier 5 thumbnail.JPG

 

Modified: 12 Sep 2017