These structures rapidly led to the accumulation of large amounts of sand on the north coast of Griffiths Island and back shore erosion north of the breakwaters. A protective stone wall was added in 1911.
The development of these structures led to an increase in sand accumulation on the north coast of Griffiths Island and erosion at the backshore, particularly near the breakwaters. A protective stone wall was constructed in 1911 to mitigate these effects.