RedactedNarrative: operator1 WAS OPERATING HIS JET SKI TRAVELING NORTH ON THE COLORADO RIVER, AGAINST THE CURRENT.  operator2 WAS ALSO TRAVELING NORTH, APPROACHING (VESSEL #1) FROM HIS LEFT (WEST) SIDE.  operator1 MADE A LEFT TURN HITTING JET SKI (VESSEL #2) CAUSING BOTH OPERATORS TO FALL OFF THEIR JET SKIS.  BOTH OPERATORS RECEIVED NO INJURIES.  (VESSEL #1) RECEIVED MODERATE DAMAGE ON THE FRONT LEFT CORNER OF THE WATERCRAFT.  (VESSEL #2) RECEIVED MODERATE DAMAGE ON THE FRONT RIGHT, UNDERSIDE OF HIS WATERCRAFT.