In March 2001, Built Environs completed the $14 million Hindmarsh Island Bridge project, between Goolwa and Hindmarsh Island in South Australia.

The 319 m bridge has a curved concrete deck and steel girder superstructure, supported by a substructure of nine concrete piers and two concrete abutments.

Around 2900 m3 of concrete, 500 t of reinforcement and 640 t of steel girders were used in construction.

The bridge was built using the incremental launch method, improving safety and saving time.

First, beams were launched from the island abutment and fixed to piers in the middle of the river. Work then began on the deck on the island side. Next, beams were launched from the land abutment to meet the mid-river beams and welded to form one continuous element.

Five weeks of project time were saved by launching beams and concreting decks at the same time.

Continuous consultations were held with local Aboriginal communities, with monitors present during excavations.

In 2001 the project received state and national awards from the Institute of Engineers Australia and the Master Builders Association.

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