22,300 square miles, 307 miles long, 118 miles wide at its widest point, 923 feet deep at its maximum depth Lake Michigan in the south is said to have Flatheads. They have not been found north of Muskegon theough. Channel cats abound all over the lake and consistent bigguns are caught in the Menominee river in the lowest part of the upper peninsula over by the wisconsin border. (Try cheese bait or a hunk of bratworst and you might hook a wisconsinite!) There is minimal pressure on cats here, as folks still target the popular sportfish such as salmon, trout, perch, bass, walleye, and the like. Try the mouth of the bigger rivers- the St Joe, the Grand, the Kalamazoo, the Muskegon.... they will be the likely spots for massive kitties.