RedactedNarrative: V1, a 19' Action Craft, with unknown operator, was headed in a northwesterly direction entering the northwest fork of the Loxahatchee River. According to several witness's, V1 was operating at a high rate of speed making sharp turns port and starboard. The unknown operator lost control impacting a cement dock piling damaging V1's starboard midship with a secondary impact to the starboard rear quarter, where the gunwale meets the transom.  