RedactedNarrative: Boat 1 had three occupants on board who were all wearing their pfd's.  Boat 2 did not have any passengers but had broken loose from where it was tied up and drifted to the gates located on the dam of the ohio river.  When boat 1 attempted to free boat 2 it was sucked into the gates where it capsized.  From there the three occupants from boat 1 were swept down stream and rescued around the lewis and clark boat ramp.