RedactedNarrative: V1 was drifting North toward bridge piling.  Operator of V1 put vessel in gear and struck bridge piling.  The operator stated that while he was attempting to return the rented vessel to the livery, there was another boat tied to the dock and the dock master asked him to wait for them to move the second vessel before Operator attempted to dock his own boat.  As he waited, the tidal current began to pull his boat away from the dock and underneath the Stickney Point Bridge.  Operator noticed that the bridge pilings were very close to his vessel and in an attempt to avoid collision, Operator engaged the throttle forward.  The vessel moved forward in a manner faster than Operator expected and collided with a cement bridge piling, making impact at the bow of the vessel, just to the port side of the center line.  After the impact, Operator turned the vessel hard to starboard which caused the vessel to scrape the same piling along the rub rail of the port side of the vessel.  After the collision, Operator was able to safely navigate back to the dock and secure the vessel.