RedactedNarrative: Vessel was cruising toward Las Vegas Boat Harbor.  Operator attempted to navigate between the Boulder Islands when it struck the northwest end of Rock Island.  The three female occupants which were wearing PFD''s were ejected into the water beyond the island.  The three male occupants were not ejected but sustained injuries due to impact with the inside of the vessel.  The male occupants were unconcious when the female occupants reached them.  Femal occupants were able to reach a cell phone to dial 911.
NameOfBodyOfWater: Lake Mead
NearestCityTown: Boulder City                  