When we were in Alaska on several different trips, we came to them in small narrow rivers just like you are describing, and we found that they are very tough, and we just dragged the boats, (in our case they were kayaks) over them and didn't damage them.
Last year in the Adirondack 90 miler, in Browns tract there was a new one, and all 400 paddlers went over it. Some went to the side, but when there was a jam up of paddlers, they were all over it, and I didn't see any damage
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