RedactedNarrative: On August 21, 2015 I, U.S. Park Ranger was notified of a boat accident in Bullfrog Bay on Lake Powell. I responded to the reporting party. SUBJECT told me that his houseboat tied to its assigned buoy in the Bullfrog Buoy Field with his red and white 1999 Chaparral  side tide to SUBJECT told me that no one was aboard his Chaparral at the time of the collision, however he watched the collision from the boat. SUBJECT told me he saw a houseboat pulling away from his Chaparral.
  
  On September 19, SUBJECT provided me with his insurance information and a witness statement describing the collission.
  
  On October 8, 2015 I spoke with president of the association that owns the striking vessel. SUBJECT1 provided me with insurance information and contact information for a person who had the striking vessel on August 21, 2015. 
  
  SUBJECT1 also told me that the person who had the vessel after subject2, identified as SUBJECT3, had to replace a propeller because it was badly damaged. SUBJECT1 provided me with a picture of the damaged propeller.
  
  On October 17, 2015 I left a message for SUBJECT2 asking him to call me back to speak about the accident. I did not receive a reply.
  
  On October 19, 2015 I spoke with SUBJECT3 who confirmed that he had changed the propeller and did not notice anything in the vessel's log about a boat accident or damage to the propeller.
  On October 24, 2015 I left a message for SUBJECT2 asking him to call me back to speak about the accident. I did not receive a reply.
  
  On October 29, 2015 I spoke with SUBJECT2 who admitted operating the striking vessel, but was unaware he hit another boat. SUBJECT2 told me he came close to a boat, but because he was operating a large boat, he did not believe he actually hit SUBJECT's motorboat. I told SUBJECT2 that the damage to SUBJECT's boat, and the damage to the propeller, were consistent with the propeller hitting the lower unit. SUBJECT2 told me it was "possible" that he hit SUBJECT's boat.
  I find that SUBJECT2 did not maintain a proper lookout in order to avoid a collision with SUBJECT's tied up motorboat. I issued SUBJECT2 Citation 4253478, Failure to Maintain Proper Lookout.
  
  Voluntary Statement: Subject
  I had my run about boat tied to the houseboat on the buoy at Bullfrog Bay and I noticed a wash from another houseboat really close to ours. I ran to the back of the boat to see the houseboat pulling away from ours. It was a few hours later that I noticed my cavitation plate on the outdrive of my boat was broken off leaving propeller marks on the drive.
  
  Voluntary Statement: Subject1
  As President of the houseboat association, I am usually notified by the various owners of any houseboat problems during their use on Lake Powell. At the beginning of week #34 (August 22-29), I received a report from Subject3, the owner of week #34, that the starboard prop was damaged when they arrived on the boat, and that he was replacing the damaged prop with a spare. I asked him to send me photos of the damaged prop--which he did. It was obvious from the photos that the prop could not be repaired. Therefore, a new one was purchased.
  When contacted by Ranger of a possible incident on August 21, involving HCTS, I gave him the information that I had--including a photo of the damaged prop. I also gave Ranger the name of the owner who should have been operating the boat on August 21st.