It didn’t completely collapse into the water. As you drive past, now going through the river, it doesn’t look like it is broken at all:
We had to walk along the bridge to see it properly. Here is the bit that broke:
Today, cars have to drive through the shallow water to go to the other side, but if you are going by foot and don’t want to get wet, this is the precarious way that you have to cross – on the edge of the concrete that is on a sloping angle down to the water.