Flood levels of the Hawkesbury River recorded at Windsor Bridge, floods 9.15 metres (30 ft) and over. Major floods shown in bold. Year Month Height (m) Height (ft&ins) 1799 March 15.25 50′ 1800 March 12.2 40′ 1806 March 14.64 48′ 1806 August 14.33 47′ 1806 October 9.15 30′ 1809 May 14.64 48′ 1809 August 14.49 … Continue reading Major Floods in Riverstone