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From demolition to replacement, the Hahnwald bridge in Niedernhausen The new replacement construction in the route of the L 3027 is a road bridge over eleven railway tracks in the city centre of Niedernhausen with a span of 73 m. The planning was carried out under great time pressure, because the existing bridge had to be decommissioned before its remaining service life due to a pier misalignment and a replacement was urgently needed for traffic reasons. Due to the changes in design demanded by the safety requirements of the Deutsche Bahn (DB), the bridge was designed as a tied‐arch bridge (with an overhead supporting structure). In addition to the adaptation of the structure to the state‐of‐the‐art, a cycle lane was added to the road cross‐section. The superstructure was produced from single elements carried to an assembly site about 600 m above the village of Niedernhausen. In early 2023 took place the transport of the about 600 t of the heavy steel construction through the village of Niedernhausen and finally the launching to its final position with the help of an intermediate support. The time‐period between the demolition and launching of the new tie‐arch bridge lasted from September 2021 to June 2023. This report covers the period from the challenges posed to maintenance management of the existing bridge to the planning of the new replacement structure, construction and opening to traffic. [ABSTRACT FROM AUTHOR]