RedactedNarrative: Owner was at helm and returning to Sheboygan from fishing northeast of harbor entrance. Operator was not using GPS chartplotter, but navigating visually with lights from city. Was a dark night with no moon, but otherwise good visibility. Operator confused either the marina or river entrance lights, or perhaps the digital clock tower downtown (all are red lights) with the pier head light at the end of north pier. Operator stated he thought he was much farther offshore than his actual location due to the distance of the lights he was looking at. Operator stated he was traveling approximately 21 miles per hour when he struck pier. Given angle of boat as it came to rest on the north pier, he would have taken the marina and river entrance lights to his starboard side.