A 200-tonne kiln fell off the back of a truck in Dawesville on Sunday morning.
The truck was traveling south when it rolled just after crossing the Dawesville Bridge at about 2am, leaving the southbound lanes closed until 7.30pm.
The kiln the truck was carrying stretches roughly 80m long and remains on the roadside with a speed reduction put in place by Main Roads.
"Due to the size of the load, the speed reduction and traffic management will remain in place until the load can be removed from the road reserve," Main Roads spokesman Dean Roberts said.
"Main Roads is currently working with the transport company to assess/remove the vehicle and load.
"This could take approximately 7-10 days."