When did Australian riverboats cease being commercial?

It’s hard to believe that Australian riverboats lasted commercially to cart wool away from inland sheep stations along the rivers for only about 80 years – from the 1850s till about the 1930s. Motor lorries started then and by the 1960s the riverboats had lost their wool carting trade entirely.

Does anyone know when the last riverboat carted wool from a Riverina sheep station to Echuca or Morgan or another railhead?

steamer-and-barges
Steamer and Barges loaded with wool.