RedactedNarrative: I state that on 7/11/16 while on patrol in West Canyon with Ranger#1, at approx. 19:31 halfway back in the canyon I observed a speedboat with occupants flagging us down and people in the water. At the same time, another small red and white ski boat was approaching the scene and also flagging us down. As we neared I could see the Tige ski boat was hard aground on a submerged sandstone mound and the other ski boat had stopped to render assistance. The other boat cleared the area after they realized National Park Service assistance was on scene.
  
  I contacted the vessel UTxxxxxx and spoke to the operator, Operator#1, identified by Utah driver's license. Operator#1 assured me no one was injured and that he had been towing some of the children when he ran aground. Operator#1 stated they were heading back towards the camp to the north and west (headed towards the mouth of the canyon) and he was attempting to stay near the north wall of the canyon to avoid sun glare. Operator#1 stated he did not see the subtle color change in the water and submerged rock about 1 foot under the surface. Operator#1 stated the accident had just occurred maybe 5 minutes before we came upon the scene. I also had noted a very strong sun glare facing to the west was forced to slow and later course due to the visibility.
  
  Ranger#1 and I photographed the scene as we assisted Operator#1 and family in gathering their belongings. We transported the family about 1/4 mile up canyon to their houseboat N12 anchored on the north side of the canyon. I gathered Operator#1's paperwork and information for the vessel accident report. As I spoke to Operator#1 I noted no signs of impairment, no alcohol was present on the boat, and Operator#1 denied consuming alcohol or drugs. Ranger#1 and I returned to the grounded vessel as twilight approached and attempted to move the boat off the rock to clear the channel of hazard vessel. We were not able to move the vessel and I boarded it to activate the white all around light and auto bilge. 
  
  We returned to the scene and Operator#1 had completed his accident statement and passenger manifest. We informed him of the vessel state and he requested Executive Services salvage the following day accepting the charges for the tow. Ranger#1 and I cleared the scene and returned to Dangling Rope Marina with all parties safe at houseboat N12 and the salvage set up through dispatch for the following morning.
  