My worst fear of going upriver in high flows has always been damaging the prop and then not being able to control the boat as I head back downriver. After your experience it makes me more concerned about anchoring in the heavy current and the perils of getting the anchor back safely. Had a buddy about get taken out by a large tree that suddenly came drifting downriver at them. No time to haul anchor had to cut it loose and haul hiney so the tree wouldn't take them out/down.