RedactedNarrative: Vessel #1 was traveling south [possibly southwest by compass reading] on the Missouri River and it's operator was having a conversation, over his shoulder, with his passenger.  At approximately the same time, Vessel #2 was departing from the sandbar to the west at a low rate of speed. As Vessel #1 continued its path and speed the Passenger of Vessel #1 saw Vessel #2 first and directed the operators attention forward. When the operator of Vessel #1 saw Vessel #2 he let off the throttle and leaned left in an attempt to avoid the accident but it was too late. Vessel #1 was traveling at faster than idle speed during its operations prior to the collision. Both the operator and passenger of Vessel #2 were injured in the collision as well as the operator of Vessel #1 indicated a possible injury.	