Boat was docked with high winds.  Operator with son went to get truck parked above at ramp.  Tie broke connecting boat to dock, passenger tried holding boat on to dock but waves were too strong. Boat floated to shore and waves poored over the back.  Turned boat around to attempt to trailer it.  At corner of dock large wave capsized the boat.  No one in boat when capsized and no injuries.
Roosevelt, AZ