Blue Plaques, Seaton, Devon Blue Plaques, Seaton, Devon The two bridges spanning the River Axe at the harbour. On the left, the new Axe bridge, with the historic bridge on the right. 127231824 127231825 127231826 127231827 127231828 This is the oldest mass concrete bridge in Britain. 127231829 127231830 127231831 Just above the new bridge can be seen the remains of a WWII defensive dam at low tide. 127231832