The study of old structures built more than 100 years ago provides for the monitoring of the breakdowns and cracks that occur due to time and the degradation of the material. In this document, the deformations and elastic strain in historic bridge are studied, obtaining its 3D model by means of photogrammetric techniques with UAV that in combination with the finite element analysis (FEA), the construction of the supporting solid that emulates the two soil layers, it is possible to analyze the behavior of the structure in case of a small seism of magnitude in the Richter scale of 1.4, the results show areas of the concrete bridge with higher deformations and equivalent elastic stresses in several instants of time, achieving a method that can be used to monitoring modern structures.