RedactedNarrative: On the evening of May 25, 2014 at approximately 5:00 p.m. I was dispatched to a boating accident involving one vessel colliding with a pier and no injuries on Lake Concordia. A thorough investigation revealed that the operator was operating a 17'4" pontoon boat with his 19 year old great nephew in tow on an inner tube. Operator neither had an observer on board nor any mirrors. Operator was travelling south bound at approximately 20 mph while facing the stern of the vessel and collided with a pier extending from the shoreline. No injuries were evident and the pier sustained moderate damage, while the vessel received only minor damage including a small dent on the bow, port side pontoon float, along with various minor scrapes and abrasions on the port side gunwale and deck. The estimated value of property damage was $6000. No drugs or alcohol are suspected in this accident. No PFD's were used and the contributing factor to this accident was no proper lookout and operator inattention.