The 427-acre ACM Smelter and Refinery site is located adjacent to the unincorporated community of Black Eagle along the Missouri River in Cascade County, Montana. The city of Great Falls is located across the Missouri River from the site. A metals refinery operated on site from 1893 until the early 1970s. Refinery operations contaminated soil, groundwater and surface water with hazardous chemicals. Investigation and cleanup of the site are ongoing.