The Severn Bridge was a road bridge connecting England and Wales.
Some time prior to the 456 incident, Captain Jack Harkness shot at an escaping alien with a plasma cannon on this bridge, blowing a massive hole into both the alien and the bridge, and causing the SUV to fall underwater. (AUDIO: Submission)
The Severn Bridge was closed and guarded by the army to prevent people from getting to Cardiff during the Good Thinking crisis. (AUDIO: Outbreak)
Gwen Cooper once drove across it toward England, and seemed to view it with some dread, giving a joking "farewell forever" to her husband, with whom she was talking. They continued to mark the occasion with humour, he asked if she "had currency" and Gwen added that she'd "had [her] injections". (TV: Children of Earth: Day One)
When driving across the bridge into Wales, Rex Matheson was surprised to learn that the two were separated, comparing it to the way New Jersey and New York were divided by bridges. He was frustrated to find that there was a toll to pay in order to cross, and cursed at the name of Wales. (TV: The New World)
UNIT once engaged a six metre crocodilian life form underneath the Severn Bridge before pacifying it and returning it to its spaceship where it left Earth in peace. (AUDIO: Vanguard)
At some point in the 21st century, the Sorvix blew up the bridge in order to cut off Cardiff and take control of it. They blamed it on an invented terrorist group called Red Doors. (AUDIO: Aliens & Sex & Chips & Gravy) The bridge was still down during the flood crisis. (AUDIO: Day Zero)
Carl Jenkins crossed the Severn Bridge when travelling from Bristol to Wales. (PROSE: The Nightmare of Black Island)