RedactedNarrative: OP1 was operating V1 with passenger.  V1 was traveling 20-30 MPH from the NW headed SE close to the dock line on the S side of Lake Alto.  V1 struck a dock and V2 which was on a boat lift.  Both the operator and passenger were ejected off V1.  Nobody on V1 was injured.  V1 had fiberglass damage to the bow from the decal on port side to the registration numbers on the starboard side.  V2 had damage to the stern of the port side pontoon which puncture a hole in the pontoon.  The was a blade on the prop slightly bent and scratches on a portion of the lower unit.  A cable to the fish finder was cut in half and a cleat on the port side stern was bent with hair lodged under it.  There was scratches and dents underneath on the aluminum portion of the vessel were the outboard attaches. Some aluminum railing on the bow was scratched and punctured due to being slammed into the dock.  No one was on V2.    V1 Op arrested for BUI