RedactedNarrative: V1 was northbound just west of Coors Island on Ft. Supply reservoir. V1 bow was weighted heavy with passengers and was dipped into the water, causing a large amount of water to enter V1. The operator of V1 gave the vessel more throttle to plane out of the water. V1 went deeper into the water. V1 took on enough water to swamp. All five occupants in V1 jumped overboard. V1 then capsized. Area of the accident was approximately 723 feet west of Coors Island and approximately 1755 feet south of the south boat ramp and approximately 3213 feet east of the south boat ramp.