RedactedNarrative: Vessel 1 left 31st street harbor at approximately 9:15 p.m. and proceeded north on Lake Michigan. The weather was clear, and visibility was good. A t 9:21 P.M. a call was received on Marine Band 16 for a vessel reported slamming into the break wall at Monroe Harbor at full speed. 
  
  CPD Marine Unit personnel arrived and observed a vessel on top of the break wall with bow pointed up. The vessel was facing Northwest towards the city. There were 8 occupants observed on board and all were taken off the vessel and taken to the Chicago Marine Safety Station at DuSable Harbor for assessment. 
  
  All 8 occupants refused medical attention. No occupants would provide statements about the incident. All of the occupants showed signs of intoxication. The operator admitted to operating the vessel, and stated he was only operating for 8 minutes before they struck the wall. He also stated he initially thought the wall was a large wave and put the throttle all ahead full to try and jump it. 
  
  He was arrested for Operation of a Watercraft while under the Influence of alcohol and Careless Operation of a watercraft. The vessel was assessed and found to have all proper safety equipment and navigational lights on and in working order. Alcohol impairment and careless operation at night were primary factors in this collision. Towboat US removed the vessel from the break wall and returned it to 31st st harbor.
  