RedactedNarrative: OPERATOR WAS TRAVELING AT A GUESSTIMATED 30 TO 40 MPH DURING THE HOURS OF DARKNESS. OPERATOR WAS TRAVELING SOUTH BOUND ON WHEN HE MADE A EASTWARD TURN AND THE BEGAN TO HEAD IN A NORTHWESTERLY DIRECTION. OPERATED COLLIDED WITH A PIER PRIOR TO GROUNDING THE VESSEL ON THE SHORE OF THE LAKE.