Accumulation of floating debris around bridge piers significantly affects local scour, posing risks to bridge stability. This study assesses the influence of cylindrical debris on scour depth around a single circular pier under clear-water conditions. Experiments utilized cylindrical debris with lengths equal to, twice, and thrice the pier diameter, each placed upstream of the pier at surface (half-submerged), mid-depth, and bed levels. Observations indicated maximum scour occurred at mid-depth with the largest debris size, while debris at the bed reduced scour compared to debris-free scenarios. These results underscore the critical impact of debris positioning and size on scour development, suggesting debris deflection as an effective mitigation strategy.