Three people were riding in a small 8 foot raft.  As they came around the bend they saw a tree had fallen in the river.  The tree was approximately 70 feet long.  As they rounded the corner, the occupants could see the tree and realized they were going to hit the tree.  They started paddling and struck the tree approximately 10 feet from the top.  One occupant was thrown over the tree, one landed on the tree and the third person grabbed a branch upstream of the tree.  The branch broke and the subject was swept under the tree.  The subject did not resurface.
Lowell                        