RedactedNarrative: On 8/12/2016 at about 08:30 I became aware of a vessel accident that occurred just prior just outside of Dangling Rope Canyon. The current water level was noted at 3617.71 and at that water level there is a shoal outside the mouth of Dangling Rope Canyon that is submerged just underwater. At the time of the accident there was a rock hazard buoy present on the shoal.
  
  I met the owner, and operator at the time of the accident at Dangling Rope Marina where they had been towed by a good samaritan. The vessel was taking on water and the bilge was actively pumping out water at a constant rate. I observed the stern of the vessel and could tell there was water flooding in from the engine compartment through the fiberglass hull. The engine was still operational and the electronics were still working. Ranger and I secured the vessel to the dock and were able to use a de-watering pump to supplement the bilge pump as we called for a salvage company to retrieve the vessel. The vessel was found to be in compliance with all required documentation and safety equipment. I detected there was no evidence of impairment or alcohol/drug use on the vessel.
  
  I spoke to OPERATOR and determined the accident happened as the couple left their beach camp near buoy 36A and boated into the marina for supplies. OPERATOR stated he noticed the rock buoy marker but did not realize the shoal was as large as it was. He was running at "cruising speed" estimated at 25 mph. He evidently failed to utilize the main channel and approach the canyon at a right angle from the mouth where the canyon marker buoy is placed. Instead OPERATOR cut the corner and proceeded directly from the main channel near buoy40 into the mouth of Dangling Rope Canyon passing near the rock hazard buoy and striking the large underwater shoal. OPERATOR stated that he never saw the shallow area just below the surface until the boat ran hard aground and came to a sop on the rocks.
  
  Antelope Point sent a salvage vessel that secured slowing the leaks and providing a tow to Quigleys trailer at Antelope Point around 13:00 hours.
  
  I issued a warning about following navigational aids to OPERATOR and made this accident report at the request due to the possibility of extensive damage to the vessel and insurance reporting purposes.
  