Abstract: The flow and sediment patterns at river junctions have been studied by many researchers. Most of the studies have conducted in river junctions of equal bed level. For the case of unequal river bed level only few studies can be found in the literature and a relation for prediction of scour depth has not been developed yet. Therefore it is the main purpose of this study to conduct experimental tests to investigate the effect of river bed discordance on scour depth. The study conducted under different flow discharge, variable river bed level and different lateral channel width. Analyses of data have shown that for discharge ratio larger than 0.74, as the river bed discordance increases, the scour depth increases too and vice versa for the discharge ratio less than 0.74. In this study an equation has been developed to predict the scour depth.