Lac Courte Oreilles Lake, or LCO, is is the largest Natural Lake in Northwestern Wisconsin, and one of the 10 largest in the state. 5,039 surface acres and 25 miles of shoreline with pristine water, and wonderful fishing. LCO is one of Hayward’s top Musky lakes, and also has some nice Walleye, Crappie, and Smallmouth Bass. The water is clear, with a 13.5 foot disk rating, and a 90 foot maximum depth. With 25.4 miles of shoreline, LCO is truly a big water lake. Feel free to leave your comments here!