4 March 2001. On 18 February 1958, Mackay was hit with massive flooding caused by heavy rainfall upstream with 878 mm of rain falling at Finch Hatton in 24 hours. The flood peaked at . The water flowed down the valley and flooded Mackay within hours. Residents were rescued off rooftops by boats and taken to emergency accommodation. The flood broke Australian records. In 1970 Queen Elizabeth II, the Duke of Edinburgh, and Princess Anne toured Australia including Queensland. The Queensland tour began on Sunday 12 April when the royal yacht Britannia entered Moreton Bay at Caloundra, sailing into Newstead Wharf. After visiting Brisbane, Longreach and Mount Isa the Royal Family travelled to Mackay. The visit to Mackay in the evening followed a late afternoon flight from Mount Isa on the 16 April. The Royal Family were taken to the Anglican Parish Hall at the intersection of Sydney and Gordon Streets for a civic reception, held in honour of their arrival. On 15 February 2008, almost exactly 50 years from the last major flood, Mackay was devastated by severe flooding caused by over 600 mm of rain in 6 hours with around 2000 homes affected. Mackay was battered by Tropical Cyclone Ului, a category three cyclone which crossed the coast at nearby Airlie Beach, around 1:30 am on Sunday 21 March 2010. Over 60,000 homes lost power and some phone services also failed during the storm, but no deaths were reported. The Dudley Denny City Library opened in 2016. In , the city of Mackay had a population of 78,685. Heritage listings Mackay has a number of heritage-listed sites, including: Alfred Street: Mackay Technical College Alfred Street: World War I Cenotaph 251 Alfred Street: Mackay Central State School Cemetery Road: Mackay General Cemetery Cowleys Road: Selwyn House, Mackay 38 East Gordon Street: East Gordon Street Sewerage Works 39 Gordon Street: Holy Trinity Church Habana Road: Richmond Mill Ruins 21 MacAlister Street: St Pauls Uniting Church 10 River Street: WH Paxton & Co buildings 31 River Street: Mackay Customs House 239 Nebo Road: Sugar Research Institute 63 Sydney Street: Mackay Town Hall Victoria Street: Mackay Court House and Police Station 63 Victoria Street: Commonwealth Bank Building 79 Victoria Street: Queensland National Bank 1 Wood Street: Pioneer Shire Council Building 57 Wood Street: Mackay Masonic Temple Geography Mackay is situated on the 21st parallel south adjacent to the Coral sea coast and