Local scour around bridge pier has been considerably examined by various researchers in finer sediment bed. However, a limited information is available on scour at bridge piers placed in coarser sediment bed (gravel bed). Furthermore, a literature review reveals that many investigators applied flow-altering countermeasures like collar plates to control and minimize the maximum scour depth. Scanty information on the application of scour depth countermeasures around a group of bridge piers found in coarser sediment has been sighted in the literature. Keeping in view the aforementioned discussion, an experimental study was conducted to investigate the effect of mutual interference of two laterally placed circular cylindrical bridge piers found in uniform gravel bed at varied pier spacing. The data on temporal variation of scour depth, scour hole characteristics like scour hole dimensions, scour depth profile along the flow direction, and the areal extent of scour are collected. The collected experimental results provide very important information to the bridge engineers. When lateral clear spacing between the bridge piers (without collar) approaches “6b” (b = pier width), scour depth approaches the scour depth of a single pier. It is observed that when collar is used around two piers the effect of interference on local scour diminishes at clear pier spacing of “4b”.