Adverse effect of local scour on bridge safety is well documented throughout the history, most notably in cases when scouring causes bridge collapse. Most straightforward way to assess scour hole depth is to employ one of readily available empirical equations, using flow field and riverbed characteristics as predictor variables. The aim of this paper is to identify empirical equations applicable for pier scour calculation in sand-bed rivers and estimate resulting scour depths. Based on the results sensitivity analysis was conducted in order to quantify range of values that can be expected in specific site conditions for variation in the input variables.