RedactedNarrative: Operator1 and Victim were fishing below the Pool 09 Dam.  Operator1 described how he was changing jigs and not paying attention to what the boat was doing.  Operator1 said he looked up and the boat was being sucked toward the eastern most roller of the lock and dam from the undertow.  Operator1 described how the stern of the boat was heading toward the lock and Victim was standing in the rear of the boat.  Operator1 said he ran up and got on the trolling motor to attempt to drive away from the dam but it did not have enough power to drive out of the undertow.  Operator1 said the port side of the boat struck the concrete landing pad near the roller and spun the boat around.  Operator1 said he then ran and got behind the console of the boat to drive away from the roller gate.  Operator1 described how Victim was attempting to push the boat away from the concrete to prevent damage.  The motor then struck the roller and witnesses observed Victim thrown from the boat into one of the roller gates before sliding into the water.  Operator1 said he did not see Victim go into the water as Operator1 was facing South and Victim was behind him.  Operator1 said he never say Victim surface after he went into the water.  He immediately tried to call the Lock and Dam to have them close the roller gates but he could not get the correct Lock and Dam so he then called 911.