A St. Charles man is seriously injured Saturday trying to tie a boat up to a dock. The incident happened at just before two in the afternoon at the 6 Mile Mark of the Big Niangua. 55-year old Craig Horyn was a passenger on a 2004 Excalibur Day Crusier. The St. Charles man attempted to tie the boat to an upright on a dock when he jumped over the boat railing and fell on the dock. He was taken to Lake Regional Hospital.