RedactedNarrative: Initial Response-  I responded to a report of a vessel fire near the Island boat ramp of Deer Creek Reservoir.  911 received several reports of billowing smoke from the back of a ski boat near the wakeless buoys.  Upon arrival in the patrol boat, the damaged vessel had been towed to shore by another boater and the damaged boat was tying off to the dock with no visible flames or smoke.   None of the occupants received any injury.
  
  Fire Investigation-   I spoke with the owner and operator of the boat.  He explained that the boat had just been de-winterized by a boat mechanic and that it was the first trip out for the year.  He explained that he had only been out on the lake for a few minutes when he saw and smelt smoke rising from the engine compartment of the inboard boat.  He turned off the boat and moved the other 8 occupants to the front of the boat and had the adults put on PFD's, as the 5 children were already wearing them.  He emptied his 5 pound fire extinguisher into the engine compartment at the rear of the boat.  Another boater came to their assistance and provided a second fire extinguisher which was emptied as well.  
  
  It appeared that the motor was not taking water through the cooling system, so that the rubber and plastic exhaust tubing connected to the motor began to melt.  The we allowed the boat to cool for about a half an hour as the motor would instantly steam any applied water.  A vessel safety check was performed and all required safety equipment was aboard.  Wasatch County fire responded to verify that there was no further risk of fire before removing the boat from the water.
  
  Vessel Damage-  owner reported by phone the next day that the boat had not been completely readied for the summer and that the water cooling system was not allowing water to cool the motor.  He reported that his mechanic would be repairing the damage.