RedactedNarrative: Upon arrival at approximately 0809 hours, I noted Page Fire using foam on a boat that was still on its trailer. The boat and trailer were still hitched to a truck. The boat and truck were 200 yards south of the water on the launch ramp. They were facing east and the trailer was against the west curb. No injuries were reported other than a minor burn on the foot of subject1. The boat had burned almost all the way to the trailer.
  
  OPERATOR1 stated that the incident actually started on the water. The boat was just off of the trailer while launching and he tried the engine and it would not start. OPERATOR1 stated he throttled the engine a little and then waited for 5 minutes. He stated that when he tried to start the engine again, there was a small explosion and smoke. OPERATOR1 used his fire extinguisher on the boat and thought everything was alright. The boat was placed back on the trailer when the fire ignited. The boat and trailer were backed against the west curb of the launch ramp while the boat burned. 
  
  INVESTIGATION CONTINUED:
  The trailer and truck appeared to be undamage. No other property was involved. I gathered information about the boat from OPERATOR1 while NPS Ranger took pictures of the scene. Three other passengers were identified as being on the boat when the explosion occurred. After Page Fire cleared the boat as no longer a fire threat, the trailer and boat were towed off of the launch ramp. The trailer was still functional. I obtained a witness statement from NPS who saw the incident from the top of the launch ramp.
  
  