UNIT 1 PASSENGER HAD JUST GOTTEN ONBOARD W/ THE OWNER/PASSENGER AND WAS GOING TOO FAST AROUND A CURVE TO THE LEFT. THE BOAT STARTED WALKING AND LOOSING CONTROL. THE OPERATOR GUNNED IT TRYING TO CORRECT TO THE LEFT AND STRUCK A TREE LEANING OVER INTO THE RIVER. BOAT STRIP WAS FOUND SUBMERGED 20-30' FROM IMPACT. COULD NOT RETREVE IT MOTOR HUNG ON THE BOTTOM.