Rehabilitation of the swing bridge from 1905, north of Spain

The bridge over the Asón estuary at Treto, is located in kilometer point (KP) 173,800 of the N-634 road, formerly known also E-70, in the North of Spain, and has been continuously inspected and studied in recent years because of its bad general condition and its importance in the regional transportation network road. This bridge presented significant problems and the structural condition level was critical previously to its intervention in 2015. The rehabilitation project including the restoration of the structural and functional safety level of the structure was deled after material studies and tests were performed. The new updated of the structure from the old nineteenth centuries to the new standard codes was also performed. This paper analyzes the recent experience in the rehabilitation and retrofitting of a singular rotating steel bridge. A part from the "green" and safe-security aspects, the intervention took into account all the social requirements of the population in the area who recovered the pride in this emblematic and centenarian infrastructure and it is, itself, a successful intervention from the resilient point of view.