The summer of 2012/13 was very dry through December and January until the last week of January when Tropical Cyclone Oswald and a tropical trough combined to dump heavy rain on the south Queensland coastlands and adjacent inland.
The rain came suddenly and all streams in the area rose very rapidly (double the rate of rise in a similar major flood event in 1999).
Dwyer Creek is a small stream with a fully forested catchment of 5 sq kilometres. It is a tributary of Yabba Creek. Though a 3M deep torrent flowed down this creek, there was very little erosion of stream banks and little impact on vegetation. A large log on the downstream side of this forestry crossing has maintained the crossing and created a shallow impoundment of the creek.
Gravel bed load and the old tree stump have been deposited here.