Castlecomer Bridge: improving safety, enhancing heritage
By TII Archaeologist Bernice Kelly
River crossings have always shaped how people live, travel, and defend their territories. For centuries, the meeting points of rivers—natural gateways through the landscape—have attracted settlement and strategic attention alike. It is no coincidence that the town of Castlecomer in County Kilkenny takes its name from such a place. The Anglo-Norman castle (caisleán) that stood watch at the confluence (cumair) of the River Dinin and its tributaries, gave rise to Caisleán an Chomair—the ‘castle at the confluence’.
Today, travellers approaching Castlecomer from the east are carried across the River Dinin by an elegant 18th-century five-arch bridge, its gently rising hump-back profile a familiar local landmark. Known as the ‘Big Bridge’ or ‘Dublin Bridge’, this is more than a functional crossing, it is an architectural statement with an eventful past, which is now a protected structure.
Image 1: Setting of Castlecomer Bridge, Co. Kilkenny (Kildare County Council National Roads Office)
The River Dinin flows southwards, dividing the town from the former Castlecomer House and its demesne, built by Sir Christopher Wandesforde (later Lord Deputy of Ireland). At this point, it is joined by two tributaries: the Clohogue from the west and the Brokagh from the east. Despite references as early as the 13th century to the ‘castle of Combre’, there is no clear record of a bridge at that time. Instead, it is likely that an early ford provided passage across the river. Indeed, the Down Survey map of 1655–8 shows no bridge here. Yet, by 1714, Herman Moll’s map of Ireland depicts a road crossing at Castlecomer, suggesting that a bridge had been constructed in the intervening years—almost certainly driven by the growing demands of the region’s coal industry and ironworks, developed by the Wandesforde family, which relied on the steady movement of workers and goods.
The earlier bridge did not endure. The Dinin, also known as the Deen or Dinan, has long been associated with flooding—its Irish name, An Deighean, is thought to describe the rapid waterflow here, hinting at a force capable of destruction. This reputation was dramatically confirmed on 2 October 1763, when a devastating flood swept away a stone bridge at Castlecomer. The disaster was widespread, destroying bridges along the River Nore and its tributaries. Historical accounts record the loss of several lives as the flood rose in the night, destroying John’s and Green’s bridges in Kilkenny and causing ‘Bennet’s bridge and that of Thomastown’ to be ‘thrown down’, while ‘two arches of Inistioge bridge were split’.
In response, the Irish Parliament allocated funds for rebuilding, entrusting the work to the Inland Navigation Corporation, who commissioned designs from the architect George Smith. At Castlecomer, construction of a new bridge began swiftly, reflecting the urgent need to restore this route, vital for the collieries.
Image 2: Castlecomer Bridge: upriver elevation (TII)
The resulting structure remains one of the town’s defining features. Built of granite, the bridge comprises five graceful segmental arches. Its most distinctive elements are the decorative niches set into the spandrels above angled cutwaters—details that lend both rhythm and refinement to the structure. These features echo classical precedents, notably the Ponte di Tiberio in Rimini, northern Italy, and reflect the influence of Palladian architecture, then in vogue. Smith employed similar motifs in his designs for Green’s Bridge in Kilkenny City and the bridge at Graiguenamanagh, placing Castlecomer Bridge within a wider group of nationally significant bridges. A contemporary painting by renowned Kilkenny artist John Comerford captures the bridge in its early years, suggesting the pride taken in this striking and then modern piece of infrastructure.
Image 3: Extract from oil painting by John Comerford (Prior-Wandesforde Family Collection)
The bridge found itself at the centre of conflict in 1798, during the Rebellion. It was a focal point in a clash between Crown forces and United Irishmen advancing north after the Battle of Vinegar Hill. Joined by local miners, the insurgents attempted to seize the crossing, pushing carts of burning hay and straw towards it. Though the town suffered extensive destruction and casualties were recorded on both sides, the bridge itself survived.
Over the centuries, it has withstood further floods and the steady pressures of modern use. However, its narrow deck—never intended for contemporary traffic—has proven ill-suited to the demands of the busy N78. Increased footfall in recent years, not least from visitors to Castlecomer Discovery Park, has added to the need for a safer crossing.
To address this, Kilkenny County Council, with funding from Transport Infrastructure Ireland, commissioned a new pedestrian bridge, upstream and independent of the stone bridge.
Image 4: Aerial view of historic bridge and new pedestrian bridge (Kildare County Council National Roads Office)
Designed by RPS Consulting Engineers in collaboration with Powell-Williams Architects, and constructed by Kenny Civils and Plant Ltd, the structure reflects modern engineering approaches while complementing its historic setting. The two-span steel bridge, supported by a central pier set on a small islet, offers a contemporary counterpart to its 18th-century neighbour.
Image 5: The new pedestrian footbridge, Miners’ Bridge, with historic bridge to rear (Kildare County Council National Roads Office)
Archaeological investigations carried out in advance of construction revealed intriguing traces of earlier activity at the site. Timber piles set within stone paving on the riverbed were identified beneath and upstream of the historic bridge. Radiocarbon dating placed one of these in the early 16th century, lending weight to the suggestion of a pre-existing crossing point. Rubble deposits discovered near the western abutment may relate to buildings destroyed during the upheaval of 1798, while a masonry revetment on the eastern side likely reflects earlier road realignment works, when the bridge approach was improved and one of its arches extended.
In 2022, nearly 260 years after the construction of the ‘Big Bridge’, the new pedestrian crossing was opened to the public. Fittingly named ‘Miners’ Bridge’, it honours those whose labour shaped the town and made such connections necessary. It provides not only a safe passage but also a vantage point from which to appreciate the historic bridge and a stone weir further upstream.
Image 6: The historic and contemporary bridges side by side (TII)
In 2025, the installation of an interpretive panel further enriched the site, inviting visitors to pause and consider the long and layered history of this river crossing.
Image 7: Interpretive panel at Castlecomer Bridge (TII)
Archaeological investigations were undertaken by John Cronin and Associates and Mizen Archaeology, with further research conducted by Rob Goodbody. The technical report can be accessed via the TII Digital Heritage Collections at https://doi.org/10.7486/DRI.6t05hh253
Posted 16 April 2026