The project focused on masonry repairs to the historic Smardale Gill Viaduct. The 14-archstructure spans 170 metres and stands 27 metres high, and was originally built in 1861 to carry the South Durham and Lancashire Union Railway. It was decommissioned in the 1960s and converted into a pedestrian bridge in 1989.
A concrete slab and drainage system were introduced however regular blockage of the drain units has led to their removal and leakage though the slab joints caused deterioration of arch barrel and spandrel wall stonework.
Following the successful installation of new drainage and re-waterproofing of the Grade II listed viaduct in 2023, Story was contracted to carry out masonry repairs to the arches and piers.
A significant challenge was accessing the arches for repairs, which was addressed using rope access techniques and a cradle system. The project involved several key activities, including the replacement of damaged and missing stones, installation of cintec anchors, re-pointing existing stonework, vegetation management, and lime grouting to existing voids.
Given the viaduct’s location within a Site of Special Scientific Interest (SSSI) and Special Area of Conservation (SAC), protecting the surrounding environment was paramount. The viaduct also forms part of a popular walking route, so public access was maintained during the works.
The team ensured that all necessary environmental, ecological, and heritage consents were in place and through effective collaboration and early contractor involvement, the project was completed successfully by December 2024, allowing the viaduct to be enjoyed for many years to come.
Three Winning Facts:
- Circa 1900m2 of stonework repointed
- 87% more stonework repaired compared to original scope
- 148 stones repaired in total
