San Miguel bridge (st michael’s bridge) is one of the most emblematic of Jaca’s monuments. Despite doubts regarding the precise date of its construction, its architectural characteristics place it in the late medieval period (15th century). Nonetheless, successive flooding by the Aragón River damaged the structure of the bridge on several occasions, leading to reforms, restorations and rebuilding. The most recent of these dates from the beginning of the 21st century, although the most important restoration was carried out in the 1950s by the prestigious architect Miguel Fisac.

The bridge was a feat of engineering for its time and for many centuries was the main means of communication between Jaca and the western valleys of the Aragonese Pyrenees. It was on one of the secondary routes of the Camino de Santiago (The Santiago Pilgrimage Route), the main route being along the left bank of the Aragón River.

The bridge is 96 metres long and has an asymmetrical profile, as it rests directly on the right hand bank of the river, which is higher and more solid, while on the left hand bank it rises up from the river’s floodplain. The bridge has a central arch with a 17-metre high span and a double-sloped profile, typical of medieval bridges. There are two smaller arches which serve as flood relief. The structure is reinforced by two buttresses between the arches.