RedactedNarrative: INCIDENT:
  On the morning of 10/20/2015, I was notified by dispatch of a small ski vessel parked at Dangling Rope Marina that was tied off to the dock unattended and was "sinking". I spoke with the Dangling Rope Marina manager directly and learned that an NPS maintenance worker was on scene placing ropes under the vessel to secure it to the dock, keeping it from sinking completely. The vessel was left over night by a visitor that had been seen earlier on 10-19-2015 after being towed into the marina by another visitor. There was no owner present at Dangling Rope at the moment, but I learned that a man was at the marina late in the evening of the 19th working on the vessel and he stated that he would return by noon on the 20th to tow the vessel down to Wahweap. The visitor had refused the Executive Services tow charges on the 19th after being offered the services by Dangling Rope staff and NPS dispatch.
  
  I arrived on scene at Dangling Rope around 10AM on the 20th and located the vessel tied up and floating in the water with the aid of a powerful bilge pump that was running off a car battery sitting in the back of the vessel. Aramark staff at Dangling Rope had pumped out the vessel, and were periodically monitoring the vessel and its batteries. I ran the vessel through dispatch and confirmed it was not a valid registration.
  
  Around 12:00 I contacted the owner of the vessel, as he returned to salvage the vessel with an Antelope Point rental vessel.
  
  INVESTIGATION:
  OWNER stated that yesterday (10-19-2015) he was with his wife in Forbidding Canyon on the way to Rainbow Bridge. OWNER stated that he was operating on plane about 20 mph, when he struck some floating debris that he suspected were small logs. OWNER hiked the trail at Rainbow Bridge, and upon return to this boat an hour later, he was unable to start the vessel. OWNER stated that he did not feel the vessel was damaged at the time or the incident in Forbidding Canyon, just that he was having issues with the starter.
  
  On the evening of the 19th, OWNER was given a tow by another visitor to Dangling Rope Marina where he spoke to a fuel dock attendant and stated that he was not willing to accept the tow charge from Executive Services. OWNER was given permission to leave his disabled boat at Dangling Rope Marina overnight by staff there.
  
  At approximately 6 AM on the 20th an employee at Dangling Rope noticed the vessel was listing heavily in the water and was nearly submerged with water completely filling the inside of the boat to the gunwales. The vessel was secured as best as possible and additional bilge pumps and a fresh battery were used to pump out the vessel.
  
  OUTCOME:
  OWNER was very hurried with his interactions with me and stated he had a limited time due to his boat rental agreement with Antelope Point. I conducted a vessel inspection and found OWNER's vessel was very old and not maintained well. There was exposed wiring, peeling trim and wooden boards were separating from the fiberglass hull. The hull appeared to be intact from the sides and looking into hatches but there was a large amount of water in the bottom of the boat. The bilge was effectively removing water out faster then it was leaking back in. However, I noted OWNER did not have a type 4 throw-able PFD, did not have serviceable PFD's onboard, and did not have a serviceable fire extinguisher. OWNER stated that he had removed the items yesterday due to leaving it unattended, however, I observed there was a pair of new water skis left in the vessel overnight.
  
  I issued a warning to OWNER for the required safety equipment. I also requested the registration and noted it was valid but different from the labeled bow numbers. OWNER provided valid AZ registration paperwork showing the vessel was actually with the matching HIN. OWNER stated that he failed to change the numbers year ago when he purchased the boat. I also issued a warning for improper bow numbering.
  
  OWNER stated he felt the alternato