RedactedNarrative: Vessel #1 was coming out of the Priest River onto the Pend Oreille River when the operator believing he was in the main channel turned upriver on the Pend Oreille River too soon and ran aground in the shallow area that exists just southeast of the confluence of the two rivers.  Passenger #3 was struck by a tree branch or brush growing in the marsh area were the vessel grounded.