The support cable snapped and landed on the carriageway at about 2330 last night. It was reported that no cars were on the bridge at the time.
"The bridge is designed to allow for struts to be removed one at a time to be repaired," said a spokeswoman for Glasgow City Council. "We don't believe the bridge's integrity is at risk, but it has been closed for public safety reasons."
The spokeswoman added that a design team would inspect the structure before deciding what action to take and the bridge will remain closed until then. No firm timeline is available for when the bridge will be reopened.
The 96m steel bowstring asymmetric tied arch bridge over the River Clyde was opened in September 2006. It carries four lanes of traffic and is designed to accommodate the proposed Glasgow tram line.The £20.3m bridge was designed by engineering consultancy Halcrow and built by Kilsyth-based civil engineering contractor Edmund Nuttall Ltd.
The bridge was awarded the Saltire Award for civil engineering, which recognises excellence in Scottish civil engineering, in November 2007.