Portage River (St. Joseph River)

Portage River is a 38.6-mile-long (62.1 km) river that flows southward through Kalamazoo County and St. Joseph County, Michigan. Its headwaters are 8 miles (13 km) east of the city of Kalamazoo at Portage Lake, and the river flows southwest to its mouth within the city limits of Three Rivers, where it drains into the St. Joseph River.

Source: Wikipedia https://en.wikipedia.org/wiki/Portage_River_(Kalamazoo%E2%80%93St._Joseph_counties)