The Black River in Sanilac County, Michigan, represents a significant warm-water fishery flowing through the southeastern Lower Peninsula. This river system supports diverse fish populations including resident brook and brown trout, along with substantial runs of Chinook and coho salmon that attract anglers from across the region. A 2013 fisheries survey documented multiple species including brook trout, rainbow trout, Chinook salmon, and coho salmon, with the river designated as supporting salmon spawning runs. The Black River watershed encompasses portions of Lapeer, Sanilac, and St. Clair counties, eventually flowing into Lake Huron near Port Huron. The river system includes various tributaries and has been subject to extensive fisheries management and assessment, with different sections classified under varying trout stream regulations.