Salmon Leap, Leixlip Demesne, Co. Kildare

At the Salmon Leap on the River Liffey in Leixlip, Co. Kildare, what survives of an ancient bridge is a single arch, a remnant preserved more by accident than by intention. Most of the structure vanished in a great flood shortly before 1646, leaving behind this solitary span as the only physical trace of a crossing that once served a busy river passage.

The name Leixlip itself derives from the Old Norse "lax hlaup", meaning salmon leap, a reference to the natural falls where Atlantic salmon would have surged upstream. Before the bridge existed, the river here was crossed by a ford, and the two features, ford and bridge, appear to have served the same general crossing point across different periods. According to early twentieth-century accounts, the ancient bridge at the Salmon Leap was a substantial structure before the flood destroyed all but one of its arches. A photograph of that surviving arch, taken in the late nineteenth century, was published by Fitzgerald around 1896 to 1899, offering a rare visual record of the remnant as it appeared before further change. A weir was also associated with this stretch of river, adding to the sense of a location that was once a working, managed point on the Liffey rather than simply a scenic one.