RedactedNarrative: Operator admitted to driving the vessel at the time of the incident and coming to close to shore while turning near Masonic Island.  Boat contacted the sandbar causing it to overturn. The speedometer of the boat was froze at 40 mph.  Two of the three occupants went to the hospital. Operator stated it was very dark in this area of the lake.  Sheriff's office indicated alcohol use of the driver but was never tested.