RedactedNarrative: On 7/4/2020, I received a call from the BLM Camp Manager regarding a boat at Holter Lake that sunk at the dock at Log Gulch Campground. The boat was moored overnight at the dock and was unoccupied when it sank.
  
  Upon arrival I found a maroon and black ski boat partially sank and tied to the dock. The only part of the boat above water was the bow. The stern looked to be resting on the bottom of the shallow bay. Ropes were fastened to the bow of the boat and attached to the dock, likely preventing the boat from completely sinking.
  
  Camp Manager stated he noticed the boat was beginning to sink earlier in the morning. The back half of the boat was slowly beginning to sink below the water line. The boat's internal bilge pumps were attempting to pump out water but were not removing enough water to prevent the stern from sinking. Camp Manager used an external gas powered pump to try and remove the incoming water, but the pump he used was not able to remove enough water before the stern completely sank. 
  
  The boat owner was camping at the Beartooth Wildlife Management Area just up the road from the dock. I contacted BOAT OWNER and gathered her and the boats information. BOAT OWNER stated the boat belonged to her, and that she and her husband had launched the boat the night before on 4/3 and left it overnight tied to the dock. She stated the boat was new and was unaware of any reason why it could have sunk. BOAT OWNER’s stated she made sure the plugs were in before the boat was launched. The boat had not been used on the lake before it sank, only launched and tied to the dock. BOAT OWNER’s had already contacted a salvage crew by the time I arrived. 
  
  Best Rate Towing out of Belgrade arrived at the lake later in the evening to recover the boat. One of the divers, verified that the plugs were in before the boat was brought to the surface. The boat was brought to the surface then put back on the trailer and taken to the parking lot above the launch ramp. I was unable to see any external damage or indicators why boat took in water. Towing informed me that he did not see any indicators why the boat sank. He also informed me that the ballast plugs where an extra ballest tank can be added to the boat were all intact.