 The Grangetown Viaduct ( Welsh : Traphont <unk> ) is approximately 1 km ( 0 @.@ 62 mi ) in length and is said to be the longest glued segmental bridge in the United Kingdom . It has 13 spans of 71 meters ( 233 ft ) with 2 end spans of 38 m ( 125 ft ) and 46 m ( 151 ft ) . 
