RedactedNarrative: Vessel 1, a 28' Suntracker party barge, was traveling westbound at approximately 3-5 mph on Cross Lake near Squirrel Point with 7 persons onboard (3 adults, 4 juveniles).  Operator stated that three of the passengers were riding on the starboard side of the upper deck, and he noticed that the vessel had a slight starboard list, whereupon he encountered a large wake from another unidentified vessel as he was preparing to have the passengers shift their location.  Vessel 1 then took the oncoming crest on the starboard bow and, as they entered the wave trough, the vessel overturned on the starboard side, completely upside down.  All persons onboard entered the water and were later assisted by Shreveport Marine Patrol.  All juveniles onboard were wearing PFD's.  The adults were not.  There were no injuries with this incident and alcohol/drugs ere not suspected.