This is the bridge that until a couple of years ago was a ford. As the river is in a cutting at this point it can only overflow rather than burst it's banks. From the video clip there did not seem to be much depth on the banks upstream. The level seemed to start to subside fairly quickly once the JCB had cleared the debris blocking the bridge. In these conditions any rubbish from the banks upstream is picked up by the flow and, at any obstruction, forms what is similar to a beaver dam.