Situated in central-western Arizona along the Lower Colorado River, the Bill Williams River National Wildlife Refuge offers a glimpse into what this landscape looked like hundreds of years ago. Today the refuge holds one of the last stands of naturally regenerated cottonwood-willow forest along the Lower Colorado River and is one of the last ecologically functioning river habitats in the southwest United States. In 1993, 6,100 acres of the Havasu Lake National Wildlife Refuge was designated as Bill Williams River National Wildlife Refuge due to its uniqueness and diversity of habitat.