The Au Sable River is renowned as one of the premier trout fishing destinations in the United States, particularly famous for brown trout east of the Rocky Mountains. This 138-mile-long waterway flows through Michigan's northern Lower Peninsula, starting near Grayling and flowing eastward until it meets Lake Huron at the towns of Au Sable and Oscoda. The river drains a basin covering approximately 1,932 square miles across eight counties and includes about 476 miles of streams within its system. With crystal-clear, cold water and diverse habitats ranging from shallow riffles to deep pools, the Au Sable provides exceptional fishing opportunities throughout the year. Designated as a Blue Ribbon Trout Stream by the Michigan Department of Natural Resources and with portions classified as a National Wild and Scenic River, the Au Sable offers both natural beauty and world-class fishing that attracts anglers from around the globe.