RedactedNarrative: On May 14, 2016, I, Game Warden1, was on boat patrol outside of Katherine's Landing Marina near Arizona Telephone Cove when, at approximately 1645 hours, National Park Service Dispatch broadcast over the radio a report of a boat accident with injuries near Arizona Telephone Cove.  The report was a jet ski had hit a pontoon boat and one of the occupants of the jet ski was bleeding from the nose.  The reporting party said they would be bringing the injured individual into Katherine's Landing boat ramp to seek medical attention for the injured.  
     I began searching in the area of Arizona Telephone Cove and could not see any signs of an accident, or anyone from shore trying to get my attention.  I began to travel towards Katherine's Landing boat ramp to see if the party had already arrived.  When I arrived at the boat ramp, no one from the reporting party was at the boat ramp yet.  I parked my boat and waited at the dock with National Park Service Rangers, Ranger1 and Ranger2.  While waiting for the party to arrive, Ranger2 drove by land to Princess Cove boat ramp to make sure the reporting party had not gone there and got the ramps mixed up.
  At approximately 1730 hours the reporting party arrived at the boat ramp.  The injured party was a juvenile, Subject1, who was riding on the jet ski with her father when the accident happened.  She was immediately evaluated by Ranger1 on the dock.  He determined that her nose had just been severely bruised.  He asked the father if he wanted the ambulance to come and transport her to the hospital and the father refused further treatment for his daughter.  Ranger1's medical report would have to be obtained from the National Park Service.
     While Ranger1 finished his evaluation of Sunject1 and spoke with her father, I began gathering witness statements from others in the party.  Only one person on shore had witnessed the accident, Witness1. Witness1 stated that she was standing on the pontoon boat and was watching her friend, Operator1, come back into the cove on the jet ski and it appeared he was struggling to get his kill switch pulled out and before he could get it out, the ski plowed into the back, left side of the boat.
  
     I then spoke with Operator1, and he stated that he pulled into the cove where they were camped.  He states that he came in too fast and he pulled on the kill leash but it did not pull all the way out and they struck the side of the boat at about 10-12 mph.  His daughter Subject1's face hit the steering bar of the jet ski and her nose began to bleed.  They called for assistance and drove back to the marina where they were met by rangers and a game warden.
  
  At approximately 1715, Game Warden2 arrived on scene to help with the investigation.  While I was interviewing Operator1, Game Warden2 took pictures of the vessels that were involved in the collisions.  After Game Warden2 finished taking photos, I concluded my interview with Operator1 and gave him information where he could obtain a copy of the report and where he could reach me if he had questions.
  
     I believe Operator1's lack of knowledge of the operation of the jet ski led him to believe that he could pull the lanyard out of the kill switch and the jet ski would stop immediately which would not have happened even if he had been able to completely pull the lanyard out.  Another contributing factor would have been off throttle steering loss due to the low speed Operator1 was traveling on the jet ski.  He would not have been able to steer the jet ski very well at that low of a speed and even if he had been successful removing the lanyard for the kill switch, would still have impacted the beached pontoon boat.  
  
     On May 15, 2016, I went to Laughlin Watercraft Rentals and Lake Mohave Resort and obtained copies of the rental agreements for b…