RedactedNarrative: On 9/11/2017 at approximately 22:11 hours, Rangers were notified of a disabled vessel on the tire line at Las Vegas Boat Harbor.  Ranger and I arrived on scene with the vessel operator at approximately 22:17 hours.  The vessel operator was with marina security after swimming to R dock for help.  The Vessel operator was identified using first-hand information.  
  
  OPERATOR1 was in his swim trunks and did not have his foreign Identification with him.  From the end or R dock, we could see OPERATOR1''S boat, a 21'' white Mariah Runabout, which had run aground on top of the tire line surrounding the marina.  OPERATOR1 stated that there was one male still on board who was reporting pain in his chest.  At approximately 23:21 hours, Paramedic and I arrived on scene with the patient aboard Park Service Vessel 41.  The patient was complaining of strong pain in his abdomen and chest.  He had bruising in both areas.  Community Ambulance was dispatched and instructed to meet us at the Hemenway Harbor courtesy dock.  Occupant was transported with OPERATOR1 by Community Ambulance to University Medical Center at approximately 00:20 hours.
  
  According to OPERATOR1, this was his first time on Lake Mead at night.  He was entering the marina when he realized that his boat slip was on the other side.  He turned while on a plane to go around the marina without seeing the tire line and ran his boat aground on top of it.  OPERATOR1 admitted to drinking earlier in the day however Ranger investigation showed that he was not intoxicated.  OPERATOR1''S boat had a 6” crack on the bottom of its hull and it''s outdrive had become disconnected in the accident.  Photographs were taken of the boat while on scene and after its recovery by the marina the next day (see attached photo logs).