Structural Health Monitoring methods may be divided into two major categories depending on the type of data used during the damage identification: static or dynamic. In this paper, it is shown that both analyses can be performed with the same instrumentation composed only of Micro Electro Mechanical System (MEMS) accelerometers. The latter has the capability to measure static and dynamic data. In very low frequency, accelerometers are used as inclination sensors to estimate static deflection. In higher frequency, accelerometers are used as vibration sensors to perform modal analysis. Both analyses are illustrated in the case of a real footbridge. Static deflections and modal flexibility-based deflections are compared in operational conditions, including pedestrian loads and temperature changes, and in artificially-introduced damage conditions. Very good agreements are obtained showing the relevance of the two approaches. Static and dynamic analyses could be used in a complementary way and provide additional information in order to reinforce the confidence and the accuracy of the damage identification.