V1 operator stated he started the starboard engine while it was docked at Duncan Dock II slip #8, throttling it with the gear disengaged.  The RPMs stayed high when he put the throttle back in neutral.  The operator advised the ignition was turned off as he moved toward the engine compartment.  When he accessed the engine compartment, he noticed the starboard motor was still running with a high RPM and at that time he noticed V1 began moving forward.  As V1 moved forward the vessel's port stern struck V2 at the midsection of the starboard pontoon causing a scuff, scratch and small dent.  The operator attempted to get back to the steering column and throttle controls as V1 continued on and struck the Paradise Dock between slip#22 and 23 (walkway) on the south side causing damage to the outside railing and walkway.  V1 then traveled over the walkway colliding with V3 causing damage to the port stern on the gunwale.
MT. IDA