In April 2006, the eye of Cyclone Monica passed directly over the Ngarradj Creek catchment which suffered extensive tree fall due to estimated wind speeds of 140 km/hour. Large wood and riparian vegetation surveys had been conducted at two gauging stations with an Allosyncarpia ternata, Syzygium forte ssp. potamophilum and Lophopetalom arnhemicum monsoonal forest in 2002 and were repeated in 2006 after the cyclone. Bankfull large wood loads increased by up to 41.8 m³/ha, up to an extra 1.5 pieces of large wood per metre length of channel were added to the channel and the average spacing between individual pieces of large wood decreased by 0.67 m after the cyclone due to the high incidence of wind throw. At least 53 % of trees in each reach had evidence of wind damage by Cyclone Monica. Large wood supply to channels flanked by monsoonal vine forest is dependent on large, infrequent tropical cyclones but the reworking of the channel boundary is dependent on large floods which only rarely coincide with tropical cyclones.