The paper presents the results obtained from the application of different output-only modal identification techniques to ambient response data collected during a dynamic tests campaign of a masonry bridge of the XIX century (1847-1849) and the subsequent Finite Element model correlation analysis. The construction is made of white limestone, it has three spans with barrel vaults on lowered arches, each about 3.50 m wide and a span length of about 7.90 m. The overall length of the bridge is equal to 35 m and 7.5 m high.

The tests have been performed by using a traditional data acquisition system with piezoelectric accelerometers in order to investigate the dynamic characteristics of the bridge.

In the numerical study, vibration modes were determined by using a 3D Finite Element model of the bridge and the information on the materials and structural details were obtained from a deep archival investigation in order to build a consistent numerical model of this historic bridge. Also, a survey by mean of a series of photos by a drone has been useful for the numerical study of the bridge.