I think the bridge that was destroyed was the Old Salisbury Swing Bridge.  This is a modern road bridge which is still there and appears in post 2010 aerial imagery and mapillary imagery.  Ref: http://www.tasman.govt.nz/document/serve/Public%20Forum%20-%20P%20Griffith.pdf?path=/EDMS/Public/Meetings/EngineeringServicesCommittee/2011/2011-02-03/000000184971