In the present paper, the Endurance Time method has been utilized for the first time for evaluating the seismic performance of arch dams. This method is a time-history based analysis procedure that utilizes special intensifying acceleration functions in order to estimate the seismic performance level of structures during a single analysis. As a case study, the DEZ dam-reservoir-foundation system is analyzed using both the Endurance Time and Time-History methods. It is found that the Endurance Time method is able to distinguish various performance levels and determine the need for non-linear analysis during high excitation levels with reasonable accuracy and a minimum time frame.