At Derryknockane in County Limerick, a modest crossing once served a stretch of low-lying, poorly drained former pasture, the kind of ground that would have been treacherous on foot in wet months and barely passable by cart in the worst of winters. That a bridge was considered necessary here at all speaks to how seriously such boggy, marginal land was once taken as a working landscape, even when it looked like little more than a sodden field to outsiders.

The site sits in an area typical of the Limerick lowlands, where poor drainage and heavy soils made movement across the land genuinely difficult for much of the year. Bridges in such settings were not decorative infrastructure but practical necessities, often serving farms, townland boundaries, or the kind of local routes that never made it onto major maps but were nonetheless used daily. The name Derryknockane, from the Irish, suggests a landscape of small hills or rounded rises within or near oak woodland, which would have made the wetter ground between those rises all the more significant as a barrier. The crossing, modest as it was, would have mattered to whoever worked or lived nearby.

Today, the area around Derryknockane has been substantially altered by the construction of an interchange on the N20, the main road running between Limerick city and Cork. The original agricultural character of the site, its low fields and uncertain ground, has been overlaid by the geometry of a modern road junction. For anyone curious about what lies beneath or behind such infrastructure, the flat, damp quality of the surrounding land still gives a sense of why a bridge was once needed here at all. The interchange itself is straightforward to locate on the N20 south of Limerick, though little of the older crossing survives in any obvious form amid the earthworks and carriageways of the modern road.