RedactedNarrative: This accident involved only 1 vessel (Open Motor Boat) A St. Clair Co. Deputy was on scene and MP Trooper was notified and arrived on scene. The Operator of this vessel stated that while operating on plane speed he looked down to replace his letterman tool when the starboard bow of his vessel struck the outside left section of a pier. Operator was thrown from his vessel and the open motor boat continued forward because operator of vessel did not have his cut off engine switch attached. The vessel struck the next pier with the port stern before veering to the right and wedging up on a wooden sea wall. The operator was not wearing a pfd when he was thrown from the vessel. there was a lot of property that was damaged. There was no injury.