Wellington Dam Anchor Monitoring

Project Overview

Wellington Dam is a 34m high concrete gravity dam on the Collie River south of Perth located approximately 200 kilometres east of Bunbury.

The dam wall was strengthened between 2009-2011 with the installation of 40 post tensioned anchors of up to 91 strands.

Monitoring of the anchors was required to verify the residual force in the anchors after 8 years of service and additionally to visually inspect the anchorage assemblies and reapply the corrosion protection as required.

Fast Facts

  • CLIENTWater Corporation
  • LOCATIONSouth West, WA

Scope of Works

  • Fortec tested 8 permanent anchors:
    • 1 x 31 strand
    • 1 x 55 strand
    • 7 x 91 strand
  • The monitoring methodology was conducted using the original Canning Dam load cell in the 91 strand Load Cell configuration with 13 x 1,412 KN hydraulic cylinders with a new strand pulling barrel fabricated to suit the Wellington Dam anchor heads
  • The hydraulic cylinders were serviced, resealed, hydraulic hoses & fittings replaced as required and the load cell recalibrated for the project


  • All works were self-performed by Fortec
  • First dam anchor lift off project
  • Client was able to modify existing equipment