The Shane’s Castle Estate is the custodian of the two largest privately owned rubble masonry bridges in Northern Ireland. Deerpark Bridge, a Grade B1 Listed structure is a 70m seven-arched masonry bridge carrying an estate road over the River Maine. The precise date of construction is unknown but it appears on the OS map of 1829 & 32, and is probably of late 18th century; the architect is unknown. In 2009 Alastair Coey Architects were appointed as Lead Consultant on this complex structural repair and upgrading scheme. Initial condition surveys were conducted from boats, with specialist input from rope access experts. The measured survey was carried out using specialist 3D high definition laser scan.
The resulting surveys revealed that overtime the masonry cutwaters and aprons had been eroded leaving the bridge exposed to the full hydraulic force of the river. Continual water migration through the body of the structure has also resulted in leeching of the mortar, undermining the structural integrity of the arches. Combined with an accumulation of inappropriate repairs and vegetation growth, major intervention is now required to ensure the long term survival of the important structures. Work has been programmed to commence in 2015.