Black River is an 81.0 mi river in the U.S. state of Michigan, flowing into the St. Clair River in the city of Port Huron. The Black River Canal in northern Port Huron extends east into Lake Huron near Krafft Road. The river rises in northern Sanilac County, near the boundary with Huron County, and its 711 mi2 drainage basin covers most of the central and southern portions of Sanilac County, most of northern St. Clair County, and portions of east central Lapeer County. Large sections of the upper portion of the river and much of its drainage basin are heavily channelized for agricultural irrigation. Black River was the original name of the city of Croswell at the time of its founding in 1845.

Tributaries

Main stream from the mouth to Mill Creek

Mill Creek

North Branch Mill Creek

Elk Lake Creek

South Branch Mill Creek

Main stream from Mill Creek to Black Creek

Black Creek

Main stream from Black Creek to Elk Creek

Elk Creek

Main stream above Elk Creek

Drainage basin

Lapeer County

St. Clair County

Sanilac County