RedactedNarrative: Operator stated that he left the Chicago Locks and entered into Lake Michigan to return to Diversey Harbor. When he exited the locks he headed north and passed east of Navy Pier, between Navy Pier and the east breakwall. He proceeded north and was attempting to exit through the gap and continue north when he lost sight of the breakwall and impacted the corner of the west breakwall. The entire port side of the vessel was damaged and the vessel was deemed a total loss.