Barwon River Tidal Barrage Refurbishment

About the project

Pensar was engaged to design and construct two fishway structures to be installed at separate locations. A vertical slot fishway was installed at the Reedy Lake site and a cone type fishway at the Barwon River Tidal Barrage site. The Barwon River site works also included the refurbishment of an existing weir.

Key Capabilities

Design and construct fishway structures; Refurbishment of weir structure

Project Location

Geelong, Victoria

Client Name

Corangamite CMA

Project Duration

December 2019 - July 2020

Project scope

  • Decommissioning of two existing lay flat gates which regulated the upstream river water levels at the Barwon River site
  • Installation of FRP sheet piles across the Barwon River
  • Concrete weir modification works
  • Rock scour protection works
  • Installation of precast concrete units
  • Modifications to the fish attraction channels


  • Coordination and management of multiple stakeholders associated with the Barwon River
  • Managing the initial geotechnical investigation to ensure the design was completed in accordance with the client’s original concept design
  • The location posed challenges for material supply and heavy plant access
  • The sheet pile materials for the replacement weir where imported from Luxembourg with a 10 – 12 week lead time


  • All works were completed while maintaining the existing levels and tidal flows of the surrounding environment
  • The installation of the FRP sheet piles was an innovative project solution to avoid the expensive requirement of cathodic protection
  • Pensar worked closely with the client, consultants and community members to achieve the successful delivery of works at both sites