As you walk along the banks of the Avon heading towards the gorge, you are outside the locks that keep the water level up in the docks and in the tidal area.  This used to be a popular location for boat to unload passengers and there are a number a jetties that have been built there.  However, the traffic for these locations dried up a long time ago and they have fallen into disrepair over the years.  The larger timber members are more resilient so you end up with these skeletal structures that are gradually collapsing.  I wonder how many more years they shall survive or whether they will be deemed too dangerous and taken down before they can collapse.