The upper portion of the Pere Marquette runs approximately 44 miles (71 km) from the forks of the Little South and Middle Branches downstream to highway M-37. In 1978, 66 miles (106 km) of the river was designated a National Scenic River. This section begins near Baldwin at the junction of the Little South and Middle Branches and continues until the river meets U.S. Highway 31 in Scottville.
This rivers original native fish was the Grayling. But due to deforestation after the great Chicago Fire, they disappeared from the river. It was then stocked with rainbow trout in 1876. In 1884, the Baldwin River, a major tributary, became the first American river to ever be stocked with European brown trout fish, which were imported from Germany, and is why they are referred to by some as German Brown Trout.
Other animal species living along this river