Vessel was moving south on the Wolf River somewhere north of Weiland's Landing.  A passing boat came north around the river and the vessel moved more to the west.  Vessel moved directly into the path of a partially submerged tree trunk.  The operator of the vessel saw the tree moments before he struck it, so he put the boat in neutral.  Vessel struck the tree stump and the boat lost all ability to steer.  Passenger of vessel noticed oil leaking behind the vessel, vessel was towed to Gill's Landing.
Mukwa