Firefighters were called out just after midnight Thursday to Beaver Creek on Lake Cumberland in Wayne County.
When units arrived, three boats were fully engulfed in flames, but quick action by firefighters, boat owners and dock workers saved other boats from being destroyed by the fire.
A few other boats received minor damages due to the heat and fire.
Firefighters were on scene for about four hours battling the fires.
Somerset Pulaski County Special Response was requested and responded to the scene to assist with fuels and oils spilled into the lake.
