England, Northumberland , Berwick-upon-Tweed. Three bridges crossing the River Tweed at Berwick-upon-Tweed. The Old Bridge, a 15 span sandstone arch bridge built between 1610 and 1624. The bridge continues to serve road traffic. The Royal Tweed Bridge, built in 1925 and in its time having the longest concrete span in the country at 361 feet. The Royal Border Bridge (in the distance), designed and built under the supervision of Robert Stephenson in 1847, a 720-yard-long railway viaduct with 28 arches, carrying the East Coast Main Line over the River Tweed.