A third semi-truck slid into a frozen lake Friday afternoon. The Star Tribune reports the 18-wheeler crashed on I-494 near Rockford Road in Plymouth. No one was injured. This is the third time in a week that a semi had to be recovered from icy water. A semi traveling on Hwy. 14 near Waseca slid onto Clear Lake Wednesday afternoon. Last week, a semi pulling a Target trailer plunged into a pond along I-94 near Monticello.