OCSC was appointed by Louth County Council to undertake the design of the restoration of the Obelisk Bridge, a historical structure which spans the River Boyne approximately 5 km west of Drogheda. The bridge is protected under the Planning and Development Act 2000 due to its significance within both the Battle of The Boyne Battlefield Site and the Brú na Bóinne UNESCO World Heritage Site. OCSC tackled the project with a multi-faceted approach that included comprehensive surveys, thorough testing, and design work to ensure the conservation and rehabilitation of the bridge closely mirrored its original design. Their meticulous adherence to statutory obligations covered the bridge’s protective status, archaeological and heritage considerations, and environmental conditions. OCSC’s responsibilities ranged from identifying the best refurbishment options to managing the planning process, providing tender documentation, and executing the tender assessment. Their appointment included resident engineer services throughout the construction stage. The refurbishment of the Obelisk Bridge included the following works:

1. The replacement of the corroded wrought iron elements in the lattice truss, cross-girders and connections.
2. The replacement of the concrete deck slab.
3. The installation of a drainage system.
4. The refurbishment of the existing bearings.
5. The deconstruction and re-build of masonry abutment towers and approach walls.
6. Installation of a protective paint system to all steelwork.
6. Repointing of all masonry.
7. Installation of a vehicle restraint system.
As the bridge is located in a Special Area of Conservation, the construction works were entirely encapsulated to prevent are debris entering the watercourse below. The project’s culmination lies in the construction of the planned works, always with an eye on OCSC’s commitment to enhanced longevity and safety of this prestigious structure.

Completion Date: May 2024
Client: Louth County Council
Construction Cost: Circa €2.5m
Service Provided: Civil & Structural Engineering