It unfortunately happens more often than one might hope. Off the top of my head the in the last half century the US has seen the Sunshine Skyway, one interstate freeway, and one passenger railway bridge over the Mississippi river collapse after a collision with ship or barge. Over in your neck of the woods I know the Tazman bridge in Hobart, Tasmania also collapsed after a freighter collided with it.
It will be interesting to see if the bridge had gotten modern dolphins to protect it, and if so why they failed here. In maps it shows up as just having some very small ones, so they may just been insufficient for size of ship.