Old Weir Bridge, Stone bridge at Meeting of the Waters in Killarney National Park, Ireland

Old Weir Bridge is a twin-arch stone bridge at the Meeting of the Waters, where the Upper Lake flows into Muckross Lake and Lough Leane in Killarney National Park. Its two arches span the narrow inlet south of Muckross Lake, and the bridge is already shown in disrepair in a 1780 Fisher print.

The bridge's exact age is unknown; it is believed to date from the sixteenth century. A 1780 Fisher print shows it already in disrepair by the late 1700s, a state it kept for at least the next hundred years. It survived the September 1867 floods that washed away local houses, including Dinis Cottage, and other wooden structures.

The Detroit Photographic Company documented this bridge through multiple prints between 1890 and 1900, preserving its historical appearance.

The bridge is easily reached via the walking trails through Killarney National Park from various entry points. The crossing is straightforward and accessible year-round, though the surrounding paths can be muddy after rain.

A 1780 Fisher print shows the bridge already in disrepair, a state it kept for at least a century. The structure then withstood the September 1867 floods that washed away local houses, including Dinis Cottage, and other wooden structures.