November 6, 1980
Overflow National Wildlife Refuge was established to protect one of the remaining bottomland hardwood forest tracts in the Lower Mississippi River Valley. Located in Ashley County, it is part of the National Wildlife Refuge System administered by the United States Fish and Wildlife Service under the Department of the Interior. These bottomland forests are used by a huge contingent of migratory birds including waterfowl, wading birds, raptors, and songbirds. Original refuge land acquisitions were limited to forested bottomlands only, as they were in eminent danger of being drained and cleared for agriculture. The refuge has been officially designated a globally Important Bird Area (IBA) by the American Bird Conservancy.