Poly Met Hrf Dam, also known as the Hydrometallurgical Residue Facility, is a private-owned structure located in Embarrass, St. Louis County, Minnesota. This earth dam stands at a height of 111 feet and spans a length of 950 feet, with a surface area of 97 acres. Its primary purpose is for tailings storage and it is regulated by the Minnesota Department of Natural Resources.

With a significant hazard potential, Poly Met Hrf Dam remains in "Not Rated" condition as its last assessment date is unknown. Although it has not been assigned an Emergency Action Plan (EAP) or updated contact information for emergency situations, the dam undergoes inspections every four years. Positioned within the St. Paul District of the US Army Corps of Engineers, this dam plays a crucial role in managing waste materials in the region.

Water resource and climate enthusiasts interested in the Poly Met Hrf Dam can appreciate its unique design by BARR Engineering and its role in storing tailings in the area. Its location in Minnesota and ownership by a private entity adds to the intrigue surrounding this structure, making it a focal point for those interested in water resource management and environmental stewardship.