In this study, the seismic performance of the historical Yılanlı (Leylekli) bridge which has been subjected to changes in geometric form over time was evaluated. In the study, the original form and modified form of the bridge were modeled using ANSYS finite element software as a 3D solid model. For both structures, stress and deformations were examined by performing static and time history ... [Show full abstract] analyzes. It is understood from the results of the analysis that changing the bridge form, which will not be welcomed in any way in terms of architecture and aesthetics, affects the earthquake performance of the building positively. Data obtained from both static and dynamic analysis show that the asymmetric bridge model is less challenging. This may be because the change in the form of the bridge structure, which is already very rigid, leads to an additional increase in structural rigidity.