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In this study, a dataset of worldwide hydropower dam accidents in the period 1896–2014 is used to analyze risks for different dam types, dam heights, stages of the dam life cycle, and accident causes in OECD and non-OECD w/o China countries. Evaluation of the risk for individual characteristics has proven to be meaningful in studies related to dam safety. Previous studies often suffered from the fact that the methods applied could not overcome limitations posed by scarce data. The proposed Bayesian hierarchical modeling presents all accidents as a multilevel system with modules reflecting specific characteristics. It samples from the entire system, and models probabilities even for modules with few data. Mean values of probabilities for both frequency and severity are combined to interpret the risk for a particular category. Embankment and gravity dams have a higher risk in non-OECD w/o China than OECD …