Recognizing the dynamic behavior of the bridges has been the central focus of many investigations. A bridge’s damage from an earthquake could have severe consequences. The natural frequency of a bridge is one of its key dynamic characteristics. The majority of bridges have unknown natural frequencies, which are meant to represent modal transformation and resonance phenomena under cyclical vehicle loads. By stimulating the bridge and monitoring its acceleration reaction with sensors, the natural frequency or free vibration study of the bridge can be ascertained. The mass and rigidity of the structure have a major influence on the bridge’s natural frequency. Above the effects of static, excessive vibrations may result in further excessive strains. The span-to-depth ratio and deflection constraints, among other codal parameters, stiffen the structure and aid to some degree reduces vibrations. These codal procedures and rules have no reliance on vibrations that are expected to happen or that are not accurate. Therefore, in order to identify the true mode of vibrations, a free vibration analysis must be carried out. This can be achieved by placing acceleration sensors on the bridge’s deck slab and measuring the accelerations; alternatively, it can be obtained numerically by utilizing software to do free vibration analysis. Using an acceleration sensor which is efficient method for gathering vibrational data, a thorough examination of the four-span integral bridge was carried out, and the bridge’s condition was ascertained by measuring the bridges’ natural frequency. The behavior of integral bridges is highlighted in this study, which also calculates the natural frequency using MIDAS software through both static as well as dynamic analysis.