The old Herøysund bridge in Nordland was chosen as a test pilot to find out how bridge disaster can be prevented in future. UiT The Arctic University of Norway, NTNU, SINTEF Narvik, Nordland Fylkes Kommune and Statens Vegvesen collaborated on a research project titled Herøy FoU that had a budget of just under 6 million NOK. UiT The Arctic University of Norway contributed on Work Package 1 i.e. Structural Health Monitoring and Work Package 2 i.e. Corrosion inspection, assessment and repair. The report focuses on ambient vibration measurements and operational traffic loading using operational modal analysis (OMA). The report describes the detailed investigation on the Herøysund bridge case study. The bridge was investigated by means of numerical models in linear and nonlinear field for the aims of the dynamic identification and during several master’s degree theses. In terms of numerical modelling, different approaches, such the largely adopted FEM model and the more innovative DMEM, have been engaged for predicting and simulating the dynamic and static behaviour. Three software have been adopted for the numerical simulations, HISTRA (DMEM), LUSAS (FEM) and ANSYS (FEM) and one for the OMA analysis, ARTeMIS ). All the model assumed a uniform concrete Young’s modulus of 19360 MPa.