Most people crossing it today are on their way somewhere else entirely, unaware that the structure beneath them has been quietly doing the same job for at least four hundred years.

The earliest documentary record comes from the Civil Survey of 1654 to 1656, a remarkable administrative undertaking carried out during the Cromwellian settlement of Ireland, which attempted to catalogue land ownership and geography across the country in extraordinary detail. That survey refers to a Finglas Bridge on the same site, suggesting a crossing had already been established here and was considered significant enough to name and record. The cartographer John Rocque also marked it on his map of County Dublin in 1760, by which point it was clearly a fixed and recognised feature of the landscape north of the city. The survey reference was later identified by the historian R. C. Simington, whose work on the Civil Survey remains a key source for this period.

The bridge sits immediately north of Glasnevin cemetery, which makes it straightforward enough to locate. Visitors approaching from the cemetery's northern boundary will find the Tolka running quietly below, its banks unremarkable to a casual glance. The river itself is modest in scale, and the crossing does nothing to announce its age. There is no plaque, no obvious marker pointing to the Finglas Bridge reference. The interest here is almost entirely layered beneath the surface, in the documentary record rather than the stonework, and that is part of what makes it worth a pause rather than simply a crossing.