RedactedNarrative: On June 19th at approximately 1350 hours I was called out to a boat that had capsized. I arrived on scene and spoke with a kayak and another boat. The kayak informed me everyone got off the boat and another boat transported them to the concession dock. The other boat was just staying near the wreck so other boats wouldn't collide with it because is was almost fully submerged. I towed the boat to the beach near the ramp so a tow crane could recover the boat. I then interviewed the owner/operator. 
  The owner/operator, later identified as OP1, informed me this was his first boat and the first time out with this boat. He had no experience boating. OP1 told me at the time of the swamping they were traveling at 30 miles per hour and when they approached another boat they throttled down to 15 miles per hour. When they throttled down the people sitting at the stern of the boat ran towards the bow because water was coming over the stern. Then the passengers all bailed out of the boat as the boat began to sink and then roll over. A nearby boat picked them up and took them to shore. I asked OP1 if they had taken on water when throttling down before, he mentioned not to his knowledge. OP1 had no idea why the boat sank. I asked OP1 if he had a working bilge pump he stated they did have a working bilge pump he tested after purchasing the boat. I informed OP1 once he gets the boat back on the trailer I would have to inspect the integrity of the boat and hull to try and determine the cause of the swamping. OP1 said it was fine the boat is totaled and I could take as much time as I wanted. The boat plug was still inside the boat. 
  Approximately at 1600 hours OP1 called me to let me know a tow crane was headed to Rockport to pick up the boat. OP1 also informed me he had a working bilge but neglected to turn it on, it was an auto bilge but the switch was turned off. Boating all day and passengers entering and exiting the boat added water and additional weight to the boat. I called Rangers and informed her the crane was headed to Rockport. I asked Ranger 1 to take some pictures and inspect the boat further for damage once the boat was over turned. Ranger 1 reported to me she found no damage to the boat other than the plywood at the stern of the boat was rotten due being subjected to water over a long period of time. This would weaken the integrity of the inside of the boat, the hull and integrity of the fiberglass appeared to be sound. All the other damage to the fiberglass and stern most likely occurred when the crane rolled the boat over and placed it on the trailer. 
  The boat took on water throughout the day.  The bilge pump was not turned on allowing water to accumulate inside the hull of the boat adding extra weight to the boat. With passengers sitting in the stern and all the additional weight from the water when the boat slowed down the stern portion of the boat (the heaviest part of the boat) dipped below the water line causing the boat to sink and eventually capsize. Lack of boating experience is a factor in the accident.
  