This photo from the Daily Mail suggests that the Sant'Angelo bridge might have suffered.
The bridge was re-faced with travertine marble and decorated with statues of angels in the Renaissance, hence its name. An angel appeared to Pope Gregory during the great plague of the seventh century, heralding it end. The bridge had to wait for sculptures until Clement IX decided in 1535 its tolls should fund a set of statues: Peter and Paul, the Four Evangelists, Adam, Noah, Abraham, and Moses. Paul III added stucco angels from Raffaello da Montelupo. The statues wore out and stone angels were commissioned from Bernini (now in the Sant'Andrea delle Fratte) by Clement XI.
It leads to the Castel Sant'Angelo. Both the 'castle' and the bridge were built by Hadrian, the former as his mausoleum. The bridge dates to AD 134, and was originally named the Pons Hadriani officially, but unofficially the Pons Aelius [Historia Augusta Life of Hadrian 19]:
Also he constructed the bridge named after himself, a tomb on the banks of the Tiber, and the temple of the Bona Dea.Apparently it 'broke' in December 1450 due to a mass of pilgrims ... but hopefully it will survive the great flood of 2008.
For more information, see Lacus Curtius.