Two days before this Rocla M-Lock® bridge was opened to traffic it suffered a textbook “one in one hundred year” storm event.
The bridge, over the Minnamurra River near Kiama on the NSW south coast, was overtopped by two to three metres of fast moving floodwater.
When the water subsided and hundreds of tonnes of debris were removed, the little bridge was unscathed.
It is one of two similar M-Lock® bridges on the river built by Kiama Municipal Council to replace ageing timber crossings.
This one, designed by KF Williams of Wollongong, is a single-lane, two-span bridge with a 30-degree skew.
Kiama Council’s Director of Engineering, Bryan Whittaker, was very pleased with the outcome: “While it was designed to cope with that and more, it’s unusual for a bridge to be put to the ultimate test before it even begins its service life,” he said.