Abstract
In this paper the authors discussed the preservation of a masonry arch bridge “Nishida Bridge” over the Kotsuki River in Kagoshima City. This bridge will be soon removed for river improvement purpose. A masonry arch bridge is a valuable structure which not only plays its own role but harmonizes the environment. The authors made a historical value study and technical investigation about the Nishida Bridge. Flood control projects built for a short time flood prevention purpose possibly impairs historical masonry arch bridges and rows of houses and stores on streets which were preserved for a long time. As a result the authors proposed a construction of underground river tunnel by which preservation of the historical civil engineering heritage may be compatible with prevention of city disasters.
