RedactedNarrative: Sgt arrived on the scene after the accident occurred. A saint clair deputy was on scene and explained to sgt that the operator of the vessel had been arrested for bui and that one female passenger was in custody for disorderly conduct. The other 3 passengers appeared to have been drinking also. No one was wearing a pfd. 
  
  Sgt proceeded to identifty each passenger still on scene and had them indicate their position in the vessel. The passenger that was seated in the center back seat was thrown forward into the bow of the vessel and was reported as knocked unconscious for a brief period and had an injury to the right shoulder. Passenger refused to be transported from ems on scene but was carried by personal vehicle to the hospital for examination. Sgt inspected and photgraphed the vessel and then released it to the joint owner to take home. 
  
  The deputy inspected the pier to ensure no one was missing from the vessel and to photograph the pier damage. Sgt then travelled to the county jail to interview the operator and the other passenger. None of the occupants were licensed to operate a vessel and alcohol impairment is listed as the contributing factor to this collision. 
  
  By witness statements received the vessel was believed to be traveling at above plane speed (40mph). It struck the center of the wooden pier and traveled directly center and traveled over the top. No other passengers were reported as injured. Although the navigational lights were operational a witness statement reported that the boat was not displaying the red/green/white navigation lights, only the blue ground effects lights were visible prior to the collision.