RedactedNarrative: V1 was traveling on plane, south, down the Blackwater River. V1 came to a left-hand bend in the river with a sandbar on the left side and trees/woods on the right side narrowing the river significantly. The operator let off the throttle trying to slow and swing V1 wide to the right to avoid crossing the sandbar. V1 could not increase speed enough to turn left before V1 collided with a tree that stuck out over the river on the right side. The collision knocked V1's operator off of V1 and into the river. Operator 1’s Xrays of his arm were negative for broken bones. He also had a small contusion on the left side of his forehead. He did not remember bumping his head, but stated he must have hit the tree with his head too. He had no other injuries.