Although many existing concrete structures have been fulfilling their purpose for several decades, they may no longer meet current safety standards due to various factors. This highlights the urgent need for innovative solutions to ensure the durability and performance of these structures in a dynamic environment.  The process of structural assessment is a crucial aspect in ensuring the safety and reliability of concrete structures such as bridges, tunnels and protection systems. Using photogrammetry techniques in combination with advanced numerical digital twins, an innovative combination of high-resolution drone survey data, photogrammetry, non-linear finite element analysis and digital twin technology is created, allowing us to combine the assessment process with a realistic prediction of the existing bearing capacity and service life. The aim is to use these techniques to determine the performance and service life more realistically and thus create a basis for sustainable infrastructures. The proposed method has already been successfully implemented and tested on the 100 meter high confined piers of the 450 metre long Jauntal Bridge and validated by a supplementary comprehensive static and dynamic long term monitoring system.