RedactedNarrative: I received a report of a boat fire near the Main boat ramp of Deer Creek Reservoir.  I observed white smoke coming out of the engine compartment of a boat about a 1/2 mile out.  I responded to the boat and the smoke had nearly stopped.  Two of the passengers were wearing PFD's.  I towed the occupants and the boat into the dock.  Wasatch County Fire Department evaluated the engine to make sure there was no longer a risk of fire.  Most of the water cooling and exhaust hoses attached to the motor had melted due to no water running through the motor.  Estimated damage at $2,000 or more.