Over the last two years, Historic Environment Scotland (HES) has funded the Ancrum & District Heritage Society (ADHS), which worked in partnership with Dendrochronicle and Wessex Archaeology to undertake an investigation that led to the discovery of the ‘lost’ bridge.

The Ancrum Old Bridge project has used historical research, field surveys, drone photography, dendrochronology, underwater archaeology and radiocarbon dating.

Radiocarbon dating of the bridge timbers confirmed a date of the mid-1300s, making it the oldest scientifically dated remains of a bridge ever found in its original position across one of Scotland’s rivers.

Initial archive research by ADHS led to the discovery of cutwater platforms and oak timbers that once supported the piers of a multi-arched bridge, hidden under the waters of the River Teviot. These are the last remaining, but also the first built, parts of the bridge.

Ancrum Old Bridge

ADHS sought to establish the age of the bridge and evaluate the condition of the remains. It approached HES for advice and support. A combination of archive research with the radiocarbon dating confirmed that the bridge stood for over 400 years.

It was built during the reigns of David II of Scotland and Edward III of England and is regarded as of historic and strategic national importance. The bridge crossed the River Teviot, carrying the ‘Via Regia’ (The Kings Way), on its way from Edinburgh to Jedburgh and the Border. HES said that James V would have crossed there in 1526, as would Mary Queen of Scots returning from her tour of the Borders in 1566, and the Marquis of Montrose on his way to battle at Philiphaugh in 1645.

ADHS also enlisted the help of Coralie Mills of Dendrochronicle who helped them take samples of the timbers in the riverbed. She was able to identify them as native oak, which is rarely found in Scottish sites after around 1450 when imported timber becomes more frequent.

Underwater archaeologists from Wessex Archaeology undertook a survey and assessment of the remains.

Timber samples were then sent to the Scottish Universities Environment Research Centre, in East Kilbride, for radiocarbon dating. This gave a date range in the middle of the 1300s.

Kevin Grant, archaeology manager at HES, said: “HES are delighted to have played a part in funding one of the most exciting and significant archaeological discoveries in Scotland in recent years. This project shows that discoveries of immense importance remain to be found by local heritage groups – and what can be achieved by bringing archaeological science and expertise together with local knowledge which has helped to unlock a centuries-held secret that will add to the fabric of Scotland’s story.”

Geoff Parkhouse from ADHS said: “Ancrum Old Bridge now has a 14th-century date. In Scotland there is not a standing bridge that is earlier than the 15th century.

“In those times, during flood or highwater, the Ancrum Bridge may have been the only place to cross the Teviot between Hawick and Berwick, making it one of the most important structures in medieval Scotland.”

Mills said: “The timber structure discovered by ADHS in the River Teviot near Ancrum is a rare survival of part of an early bridge in a hugely strategic historical location. The oak timbers are in remarkably good condition and provide really important local material for tree-ring analysis in a region where few medieval buildings survived the ravages of war. It has been a privilege to work alongside ADHS on investigating this important structure.”

Dr Bob MacKintosh of Wessex Archaeology Coastal & Marine said: "The site was challenging to survey, and particular river conditions were needed to complete it safely. The regular monitoring of the site by ADHS, and the excellent photography and surveying they completed prior to our involvement made our work a lot easier.

“The results are really exciting. In addition to the surprisingly early date, it seems the foundations were built using branders, a wooden frame laid on the riverbed upon which the courses of stone were placed. This is the first-time branders have been found in an archaeological context in Scotland. They are otherwise only known from historical sources and two accounts of engineering works on extant bridges completed in the 19th and early 20th century.”