Everyday life on bridge construction sites is commonly characterized by enormous pressure due to time and costs as well as difficult logistic requirements. Modern process simulation tools can be applied with increasing success. Projects are often affected by unscheduled constraints and limitations, that give reason to deviate from the formerly optimized plan, and to find ad-hoc solutions, especially in the erection phase. In order to meet these requirements, simulation tools in the erection phase with a more specific database are needed. An approach based on accurate day-to-day data for the current project state at any time is needed. These data then facilitate the simulation of possible variations for ongoing optimization. At first, it is necessary to determine, which choice of data is significant and actually needed for evaluating the day-to-day status in bridge construction progress. Secondly, the required data must be captured as efficiently as possible during the ongoing working activities.