RedactedNarrative: Operator stated that around 11:00 a.m. on 9/7/19, his boat was parked in the marina and he went out on the river to make sure it was running properly before his guests arrived. Around 11:30 a.m., the operator and 10 other people went out onto his boat (WC #1) Shortly after leaving the marina, Operator #1 said he remembers hitting something hard with his boat. He said he started to have engine issues at this time, but he checked in the compartments and didn't see any water, and didn't notice the pumps kicking in. He said he drove the boat through the Lock and Dam and down to Lake Pepin, not stopping along the way. On the way back to the marina, they stopped the boat in Red Wing to let the kids and dog run and stretch. After approximately twenty minutes, they drove back through the Lock and Dam and back to  the marina, parking the boat in a slip. After everybody had offloaded, he had help putting the canopy cover on the boat and went up to his camper about 8:30 p.m. He was notified the following morning that his boat was sinking in the marina. He stated that other than hitting something initially, the boat seemed to be running fine, and there was nothing else he could think of that would have made his boat sink. Life jackets were not being worn at the time of the incident. There were no injuries and alcohol was not a factor. There was an unknown amount of damage to the boat.