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Background and Objective: It is of utmost importance to analyze the causes of accidents to control and prevent their recurrences.This study aimed at analyzing the causes of amputation-leading accidents in a dam construction project using a Tripod beta and SCAT Combined Method. Materials and Methods: This study analyzed the data related to amputation-leading accidents using a Tripod beta and SCAT Combined Method. Initially, the interface and root causes were obtained by the Tripod beta Method and were subsequently placed in SCAT cause and effect table along with the suggested control provisions. In addition, the data were collected using questionnaires, and the effect of the causes of accidents and their ranks were evaluated using the Chi-Square and Friedman tests, respectively. Accordingly, appropriate control measures and necessary suggestions were provided in this study. Results: According to the results, the underlying causes were classified into 6 categories. Maintenance management (25%) and training (20%) obtained the first and second ranks. On the other hand, the executive instructions (5%) obtained the lowest rank. Moreover, 13 preconditions were determined in this study. The most important indirect and root causes were "inappropriate machine lifting (rank: 2.69)" and "the erosion and excessive deterioration of the mechanical excavator (rank: 4.55)", respectively. Furthermore, the most important control measure was "the inspection and control of the operation (the mean rank: 5.05)". There was also a significant relationship between indirect and root causes. A P-value less than 0.001 was considered statistically significant. Conclusion: The combined method presented in this study has met the needs of different organizations in many cases and is currently one of the most important methods to analyze the accident causes. Therefore, it is suggested to combine the SCAT with other methods to analyze the causes of accidents in dam and construction projects. [ABSTRACT FROM AUTHOR]