On 26 to 28 December 1999, high rainfall in the northern suburbs of Melbourne caused localised flooding. In Carisbrook, central Victoria, over the same period the local catchment area received the most significant rainfall totals in more than 100 years. The southwest side of the town was flooded by overland flows from the Mosquito Flat and Craigie catchment area between Carisbrook and Maryborough. A number of properties in the town were affected and the Pyrenees Highway was closed.

The Insurance Council of Australia estimated the 1999 damage at $10 million, with the 2011 estimated normalised cost of $23 million.