RedactedNarrative: SYNOPSIS
     On 7/18/18 there was an explosion on a houseboat at Bullfrog, Lake Powell. No occupants were on the boat and no one was injured. The boat was a complete loss as a result from the fire.
  
  NARRATIVE
     On 7/18/18  the houseboat named 'FELICITY' was docked in slip under the covered docks at Bullfrog Marina in Lake Powell; there were no occupants aboard the vessel. At 2110 hrs NPS dispatch received a call that a boat was on fire. Witnesses stated there was an explosion on the houseboat 'FELICITY'. The explosion was powerful enough to scatter debris onto both of the vessels parked on either side, and forty feet in front of 'FELICITY'. 
  
     The owners of the vessel docked next to 'FELICITY' in were in their vessel when the explosion happened; owner completed a witness statement (see attached). Owner claimed the fire was at the stern of the vessel and he tried to put it out with his fire extinguisher. Subject2 was on his boat in slip when the explosion occurred. SUBJECT2 claimed he responded to 'FELICITY', felt the fire could not be suppressed, and instructed people at the scene to untie 'FELICITY' and push it away from the docks. SUBJECT2 is a fireman in the Salt Lake City area; SUBJECT2 completed a witness statement (see attached).
  
     SUBJECT2 claimed 'FELICITY' was burning at the stern end when they pushed it away from the docks, and that the flames where not very high. Less than thirteen minutes 'FELICITY' was at the breakwater and fully engulfed in flames. SUBJECT2 thought once 'FELICITY' got out into the lake and into the wind, the fire moved throughout the vessel. SUBJECT2 heard three explosions as 'FELICITY' drifted towards the breakwater; one explosion was noticeably louder than the others. 
  
   NPS dispatch recorded the following timeline: 2010 hrs, call came in a boat was on fire; 2015 hrs, boat is at the breakwater fully engulfed; 2026 hrs, NPS fire boat is on scene; 2104 hrs, boat is at the Main Bullfrog ramp. The distance from the dock to the breakwater is approximately 100 feet. 
  
  EVENTS LEADING UP TO THE EXPLOSION
     SPENDRUP claimed the following. 
     -One of the co-owners of 'FELICITY' had worked on 'FELICITY' all day Tuesday (7/17). 
     -Subject told him he was working on the port engine and inverter.
     - Subject left  'FELICITY' at approximately 0930 hrs Wednesday (7/18).
     -He and his wife went boating on the lake Wednesday and returned to their slip at approximately 1700 hrs. When they returned his wife stated she smelled gasoline. 
  
  INSPECTION OF THE VESSEL
     On 7/21/18 I met with NPS Rangers and inspected 'FELICITY' at Aramark dry storage at Bullfrog. There was not a drain plug so several holes were made in the hull and transom with a drill and axe to drain the water. Deputy State Fire Marshal conducted an inspection and concluded the following: gas fumes were present in the engine compartment; a spark occurred in the engine compartment that ignited the fumes; the explosion was probably started in the area of the port engine. The vessel was burned completely down to the steel mono hull. Hoses and electrical wires sustained damage, some to the point where they were completely gone.
  
  STATEMENT FROM OWNERS
  The generator didn't have an external fuel tank and was portable. They stored portable plastic fuel tanks on the main fuel tank in the engine compartment and secured them with bungees. To keep corrosions off the outdrives an isolation transformer was installed. The extension cord that ran from the bow of the vessel to the engine compartment supplied electricity to the isolation transformer and a battery charger. The blower motor that exhausted fumes from the engine compartment worked when he was at the vessel in May. The fuel tank held ninety gallons. He estimated it had seventy gallons of fuel in it when the explosion occurred.
  
  
  Subject
  The automatic bilge pump was working. The engine compartment blower was working. The blower was activated manually with a switch. The fuel tank had 13" of fuel in it. The fuel was checked by a dipping a stick into the tank. The shore power was connected when he left the vessel on 7/18/18. Nothing was being powered by the shore power. He didn't work on the engines on 7/17/18. Two or three years ago the vessel was taken out of the water and taken to Offshore Marina where work was performed on it. The smaller fuel tank after the main tank hadn't been used since he had been involved with the vessel. He hadn't connected anything to the extension cord that ran from the front of the boat to the engine compartment. Nothing electrical should have been running when he left the vessel on 7/18.