RedactedNarrative: Two people were on a boat on July 3, 2015 with 3 of their daughter and two other friends.  The boat is owned by Operator1's father.  They launched around 9;00 from the north marina of Willard Bay and did some fishing throughout the morning hours.  
  
  As afternoon came they started water skiing and tubing behind the boat.  Around 14:00 the boat quit running and wouldn't start.  All the girls got off the boat and were swimming around and playing on the tube that was being pulled behind the boat.  Operator1 pulled the engine cover off and started looking at the engine to see if he could figure out why is was not running.  Operator1 said he pulled the gas line off and blew into it to make sure there was gas getting to the engine and he believed there was still enough gas  to run the boat.  
  
  After looking at the engine for a few minutes Operator1 put the cover back over the engine and went to the front of the boat.   Operator1 went back and opened the engine cover and fire started coming out of the engine compartment.  Operator1 stated he grabbed the fire extinguisher but by the time he got it the fire had spread far enough he didn't think the fire extinguisher would be effective.  
  
  Operator1 grabbed all the life jackets he could and he and his wife jumped out of the boat.  Everyone swam away from the boat and shortly after another boat came over and picked up all the occupants in the water.  All people in the water had life jackets on.  The boat very quickly filled with flames.  
  
  Two PWC drivers saw the fire and went over to see if they could help.  The fire was burning and they could see no one was in the boat.  The PWC's drove by and splashed water on a boat a few times until the flames were out of the boat.  Shortly after Ranger and I arrived on our State parks boat at the scene.  
  
  By this time there was no fire or smoke on the boat.  We loaded all the occupants onto our boat and got all of their information.  We hooked our tow rope to the burnt boat and towed it into the north marina.  During the tow one of the bars on our tow bar broke so we had to proceed slowly to the north marina.  
  
  I was unable to complete a vessel safety inspection because everything inside the boat was burned.  Operator1 stated he had all the safety equipment on board during the incident.  We assisted Operator1 with loading the boat onto the trailer and had to use a rope to hold the engine off the ground so it would not drag.  I got 5 witness statements; one from Operator1 and wife and two of their daughter and one other witness that was on a PWC.  There were no injuries to anyone involved.  The boat is considered totaled.