Cyclone Marcia (Marcia) formed on 18th February 2015 and intensified rapidly, crossing the coast near Shoalwater Bay, Qld. as a rare Category 5 cyclone. (USA Cat.4). Marcia remained a category 3 far inland on 20th February and after several hours of heavy rainfall, intensities increased with around 250mm of rain in 3 hours over the western slopes of the Calliope Range (Official report).
Multiple record flood height were observed along Bell, Callide, Grevillea, and Kroombit Creeks. Callide (Gated) and Kroombit Dams both observed floods of record with erosion to the toe of Kroombit Dam with 10000-year levels level observed. Environmental monitoring equipment was damaged with one gauging station and building (Stepanoffs) never located.
There was significant flood impacts to residential areas and infrastructure throughout Callide Valley.