RedactedNarrative: On 05/21/2021 at approximately 2016 hours, I Officer 1 was dispatched to a collision involving two vessels and the boat dock at Williamstown marina on Williamstown lake in Grant county Kentucky. Vessel 1, was operated by V1 Operator and occupied by a second passenger, V1 passenger. Vessel 2, was not in operation and was docked in a boat slip at the marina but had two passengers onboard. The operator of vessel 1, V1 Operator, stated that he had backed away from the dock to leave the boat dock area in his vessel and had put his vessel into forward gear, he then placed his knee up on the seat as he was turning to leave the boat slip. He stated that he slipped on the seat with his hand on the gearshift and had fell onto the gear shift causing it to go approximately 80% throttle in the forward position. V1 Operator stated that he realized he could not stop the boat before hitting anything and so he turned attempting to minimize the damage that was done to the dock and to vessel 2. Vessel 1 then struck the stern of vessel 2 as well as the support post for the dock. Vessel 2 sustained significant damage to the stern of their vessel during the collision. There were no injuries on either vessel. The operator of Vessel 1 stated he had consumed 2 beers during the course of the day. Field sobriety tests were administered to V1 Operator and there were no signs of impairment. However based on witness statements, V1 Operator own admission of alcohol consumption and our response time, I can not rule out the possibility that alchohol may have been a contributing factor. 