Britannia Tubular Bridge (part in Treborth Community)

The Britannia Tubular Bridge, located partly in Treborth Community, is a Grade II listed structure. The bridge features piers made of rock-faced Anglesey limestone, known as Penmon Marble, set on a plinth, along with Runcorn sandstone and brickwork. Each of the two central water piers stands 221 feet 3 inches (67.5 meters) tall from the foundation on the sea bedrock. These piers have battered sides and a corniced top, supported by large corner blocks that create voids originally intended to hold suspension chains over rockers, all designed in an Egyptian Pylon style. The piers are hollow, with 20-foot (6-meter) long stone lintels spanning the rectangular openings for the twin tubes, and bold plat bands marking the top and bottom of the tubes. Each side face features a symbolic engineering motif based on linked driving rods. The outer spans connect to similar abutment towers, which are flanked by sculptured lions on high plinths. A large figure of Britannia, designed by Thompson for the center pier, was never completed. An inscription on the approach face of the mainland water pier reads, "Erected Anno Domini MDCCCL Robert Stephenson Engineer." The modified bridge, which opened on June 11, 1980, consists of braced riveted steel section arches with 'N'-truss spandrels spanning between the original piers, with the roadway supported on stanchions above the railway. The side spans are constructed in reinforced concrete.