RedactedNarrative: The vessel was proceeding uplake at speed. It was on a course outside the buoy line and main channel when it struck a large rock formation. The formation was covered by approximately 1-2 feet of water. The vessel was driven up onto the formation to about 1-2 of it total pontoon length. Upon my arrival it was firmly aground. There was no indication the vessel was taking on water.
  
  Antelope Point was contacted by NPS dispatch and a chase boat arrived at approximately 0930 hours (MST).
  
  There were no injuries. I provided operator with education regarding using navigational aids on the lake.
  
  