RedactedNarrative: 2 vessels were maneuvering within a flood gate structure. Vessel 1 containing 3 occupants was at cruising speed inside the structure as Vessel 2 containing 3 occupants was making a turn into the structure at cruising speed.  The turn was a blind turn restricting vision for both vessels.  As Vessel 2 entered the flood gate structure, a port side to port side collision was made by the two vessels.  2 passengers on board Vessel 1 were ejected into the water. The operator of Vessel 1 fell in the boat. One subject in Vessel 1 went to the hospital for injuries.  The other 2 subjects in Vessel 1 did not seek medical attention but sustained minor injuries. Both ejected subjects were wearing PFD's and were immediately recovered. Vessel 1 does not have much damage. Nobody from Vessel 2 was ejected only one minor injury. The injured subject did not seek medical attention.  No PFD's were worn by subjects on Vessel 2. Vessel 2 has major damage. Alcohol or drugs were not believed to be a contributing factor.