Two-dimensional hydraulic model tests and numerical calculations were conducted to reveal the stability of concrete bridge on reef against storm waves. The characteristics of standing wave were examined for different reef conditions by the numerical calculation with CADMAS-SURF. Based on the numerical test results, the patterns of wave run-up were disclosed for several reef conditions. The bridge girder failure at Ohmori Coast, Kamoenai, Hokkaido in 2004 was predominant at the loop of standing wave condition, and the same damage pattern was confirmed by the wave force tests. The characteristics of horizontal wave force on bridge pier were also studied to be critical at the node of the standing wave.