page_title: Drygrange Old Bridge
section_title: Design
hierarchical_section_title: Drygrange Old Bridge / Design
caption_attribution_description: English: Three bridges over the River Tweed at Leaderfoot Traffic is crossing Drygrange Bridge (1971-73), a composite structure of reinforced concrete and steel box girders. The bridge behind is Drygrange Old Bridge (1778-80), a three-arched stone bridge now closed to vehicular traffic, and the bridge beyond is Drygrange Viaduct (1863-65). Built for the Berwickshire Railway, it has nineteen slender piers of rustic-faced sandstone, the tallest being 37m above the River Tweed. The railway line was closed in 1948 but the bridge is in the care of Historic Scotland. (Source: Borders and Berwick, An Architectural Guide by Charles Alexander Strang).
context_page_description: The Drygrange Old Bridge is a disused road bridge over the River Tweed near Melrose in the Scottish Borders.
context_section_description: The Old Bridge has a central span of 105 feet (32 m), with two side spans of 55 feet (17 m), and a smaller arch in the south abutment. The central arch has a rise of 34 feet (10 m). The rounded cutwaters are carried up to the level of the roadway and are topped with angular pedestrian refuges.
  Hollow spandrels reduce the weight of the structure, an innovation by Thomas Telford. The bridge has been modified by raising the level of the roadway on the approaches to make it more level, but the level of the original roadway can be seen in the string course on the exterior of the bridge.
  It is near to the Roman settlement of Trimontium, which is to the south-west of the viaduct. To the west of the bridge is the Leaderfoot Viaduct, a disused railway viaduct, and to the east of the Old Bridge is its modern successor. This group of three bridges is sometimes known as Tripontium.
caption: "Tripontium", with the new concrete road bridge in front of the Old Bridge and the viaduct behind
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