Paddled the mangles (buller) the other day when it was really low. Came acress a tree on the lower section where there is usually a small move left to right as it narrows. Right at this point was a tree that would be OK at higher flow except if swimming, it was just showing at a very low flow. I didnt know it was there as never been on the river this low before. Dont know if this is the same for others.