RedactedNarrative: On June 07, 2017, I (CPO) was informed of a boat accident that may have occurred as the result of a wake violation in the 31st Street Harbor in Chicago, IL on June 4, 2017.  I received a report (# 04925) form Chicago Marine Unit with a summary of the event (See Attached).  I followed up with interviews with all parties involved on June 11, 2017. 
  
  Unit 1 stated he had come into the harbor at approximately 3:00AM on June 4, 2017.  He stated the water was calm and he saw no wake coming from his boat.  He also stated he was traveling at approximately 5 to 7 knots.  Operator1 provided me with a written statement (See attached).  
  
  Unit 2 and Unit 3 stated that they were awoken by their boats slamming off the docks.  They stated they came out of their cabins and observed a boat with the name “Another Dream” on the stern traveling through the channel and producing a big wake.  Both owners of Unit 2 and Unit 3 provided written statements (see attached).  
  
  I observed damage to a piece of chrome trim on Unit 3''s port side (see attached photo) and spider web cracking on unit 2 swim platform on the stern.
  
   On June 13, 2017, I received notes in regards to this incident.  The notes were added to the report (See attached).