Grand Traverse Bay is an arm of Lake Michigan that is located on the Lower Peninsula of Michigan near Traverse City. The bay covers more than 30 miles long and 7 to 10 miles wide with water that extends down more than 600 feet deep. This is a huge piece of water that offers anglers and boaters a fantastic area to enjoy Lake Michigan’s waters while having some protection in the bay. There is a west arm and an east arm as well. The fishing is very good for many species of fish, but the smallmouth bass and lake trout are here in large numbers with many big fish possible too.