Closely associated with the Enoggera Dam while it was planned by the council, he later saw it constructed as a member of the Board of Water Works; as its chairman in 1875 he was a leader in implementing the Gold Creek Dam and planning of the Mount Crosby Weir.
On 1 March 1858, stonemasons working for John Petrie won the eight-hour day, which was first commemorated on 1 March 1865.
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With advancing years Petrie handed over more and more control to his eldest son, John, who became first mayor of Brisbane.