Xizhi District, located in northern Taiwan and flown through by the Keelung River, has faced significant flood hazards over the years. To address the risk of flooding, the river management authority urged the New Taipei City (NTPC) Government to promptly demolish three old bridges that did not meet the required flood protection criteria. Among these bridges, the NTPC selected Chang An Bridge, which measured 108 m*10 m, as the first project for reconstruction. To strike a balance between local traffic needs and flood risk mitigation, the decision was made to construct a new pedestrian and bike bridge to replace the old one. Several constraints had to be considered for the project. Firstly, the new bridge needed to be elevated 2.5 m higher than the old bridge, requiring careful design of the connections between the bridge ends and the adjacent roads. Secondly, permanent piers were not permitted in the river channel. Thirdly, the working platform in the riverbed had to be dismantled during the typhoon season. After extensive discussions, the NTPC opted for a steel truss bridge and the bridge rotation method (BRM) for the project. Additionally, the city government planned to use the old bridge as an assembly platform. This arrangement not only effectively reduced project costs and duration but also minimized the risks associated with working in the river channel. Thus, the case study demonstrated that BRM facilitated a faster, safer, and more cost-effective bridge reconstruction project.