RedactedNarrative: Vessel 2 was traveling downstream while vessel 1 was following behind.  As they approached the US 422 bridge, vessel 2 looked behind him and observed vessel 1 following and believed he had plenty of time to make a left-handed turn.  
  
  Upon completing a 180 degree turn, vessel 2 was then struck by vessel 1 who was traveling approximately 40-50 mph.  
  
  The impact caused a radial fracture in the operator of vessel 2's left arm and subsequently threw him off the vessel and into the water.  
  
  Vessel 1 continued forward and landed on the shoreline where the operator reboarded and drove to shore.  The operator of vessel 2 was transported by ambulance to the hospital.