The Alliance of Rouge Communities (ARC) is a voluntary public watershed entity currently comprised of 36 municipal governments (i.e. cities, townships and villages), three counties (i.e., Wayne, Oakland and Washtenaw) and the Wayne County Airport Authority as authorized by Part 312 (Watershed Alliances) of the Michigan Natural Resources and Environmental Protection Act (MCL 324.101 to 324.90106) as amended by Act No. 517, Public Acts of 2004.

The purpose of the Alliance of Rouge Communities (ARC) is to provide an institutional mechanism to encourage watershed-wide cooperation and mutual support to meet water quality permit requirements and to restore beneficial uses of the river to the area residents.