RedactedNarrative: On 08/09/14 at approximately 6:30 P.M., Vessel 1 ( Blue 25'' Sun Patio Pontoon Boat) operated by Operator1 entered Independence Bay. Vessel 1 circled the bay and approached Vessel 2 (Blue 20'' Sylvan Pontoon Boat) which was facing North beached on the bank. Operator1 shifted the throttle from forward to reverse to give the vessel he was operating enough room to make the turn without colliding with Vessel 2. Operator1 shifted the throttle forward striking the starboard (right) stern (rear) of Vessel 2. Operator1 claimed the throttle was stuck. (I tested the steering and the throttle and found no deficiencies. I also spoke the mechanic at K and S Marine, the marina where the vessel is repaired and stored and he explained there were no flaws with the throttle.) Vessel 1 proceeded to strike the dock and make contact with Vessel 3 (White and Blue 20'' Godfrey) which was tied to the end of the dock facing West. Vessel 3 was unoccupied. Vessel 2 was occupied by someone who was laying down in the back of her pontoon boat (Vessel 2) while her husband was on the bank playing with their two children. Operator1 was arrested for OUI (B.A.C. 0.155). See supplemental report for further information.