Erosion at C.Y. O'Connor Beach

The City of Cockburn's response to Fremantle Herald about erosion to C. Y. O'Connor Beach

It should be noted that the Engineered Fringing Reef has been in place at C.Y. O’Connor Beach for less than a year. The City does not believe that there is any increase or decrease in erosion at this point in time that can be attributed to the fringing reef.
C. Y. O’Connor beach, including the area north and adjacent to Catherine Point groyne, has a history of erosion over many years dating to before the groyne’s installation. Erosion at this beach occurs at various times of the year, including summer. Erosion is associated with weather conditions, coastal currents and associated sand movement and availability.

Question: Has an assessment of the effectiveness of the offshore concrete barriers been carried out?
The University of Western Australia’s Oceans Graduate School has been engaged to monitor the effectiveness of the Engineered Fringing Reef at C.Y. O’Connor Beach for a period of three years. 
Question: If so, when was the assessment.
Monitoring commenced when the reef was installed in April 2022. Final monitoring results are not expected until April 2025. Monitoring over this period of time will give a true indication of how well the reef is performing.
Question: If so, what was the finding of the assessment; have they proven successful?
See above.
Question: If not, when is an assessment due and what sort of factors does it look at.
Monitoring will last three years. Monitoring sensors assess sand movement across the seabed and sand accretion or loss on the beach.

For more information contact

Media and Communications Officer
City of Cockburn

Email [email protected]

Phone 08 9411 3551

Related Pages



City of Cockburn
Whadjuk Boodja
9 Coleville Crescent,
Spearwood 6163

PO Box 1215, Bibra Lake DC,
Western Australia, 6965

Office opening hours:
8.30am to 4.30pm
Monday to Friday (excluding public holidays)

Language Support

Social Media

Cockburn Nyungar moort Beeliar boodja-k kaadadjiny. Koora, yeyi, benang baalap nidja boodja-k kaaradjiny.
Ngalak kaadatj dayin boodja, kep wer malayin. Ngalak kaadatj koora koora wer yeyi ngalang birdiya.

City of Cockburn acknowledges the Nyungar people of Beeliar boodja. Long ago, now and in the future they care for Country.
We acknowledge a continuing connection to land, waters and culture and pay our respects to the Elders, past and present.