RedactedNarrative: On the night of June 17, 2018 at approximately 22:25, Operator was operating a 23'' 2011 Mastercraft X35 boat on Douglas Lake in Jefferson County. He had three additional passengers on board. Operator was driving the vessel from the dam upstream towards Muddy Creek. Operator navigated the channel located between Cowboy''s Seafood Restaurant and the north side of Big Island. The vessel impacted one of the smaller islands near Big Island. Upon collision, the vessel ramped up a rock bank and came to rest in a cluster of trees. The bow of the vessel was elevated off the ground into the tree cluster while the transom and swim platform rested on the shoreline. All four people on board were seriously injured in the collision and were transported by ambulance and LifeStar helicopter to UT Medical Center for treatment.
  
     Based upon officer investigation and occupant statements, I determined Operator was unfamiliar with navigating in this area of the lake. Operator stated he was traveling at approximately half throttle before the collision and had been told by passengers that he needed to slow down. Operator was not maintaining a proper lookout in order to see the hazard. Alcohol was present in the vessel and Operator stated he had been drinking. He refused to submit to blood alcohol test as required by law. A search warrant was obtained and a blood sample was secured from Operator. Operator did not have permission to operate the vessel on the lake.