Poly Met Hrf Dam
Poly Met Hrf Dam is an earth dam located in St. Louis County, Minnesota. It carries a Significant hazard potential classification.
About Poly Met Hrf Dam
The primary purpose of Poly Met Hrf Dam is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by Poly Met Mining, Inc. (private).
The dam stands 111 feet tall and stretches 950 feet across, and creates a reservoir covering 97 acres.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 02/09/2023.
At 111 feet, this dam is taller than 98% of all dams in the United States.
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Location
| State | Minnesota |
| County | St. Louis |
| Nearest City | Embarrass |
| Coordinates | 47.60757, -92.15265 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 111 ft |
| Dam Height | 111 ft |
| Dam Length | 950 ft |
Storage & Hydraulics
| Surface Area | 97 acres |
Ownership & Safety
| Purpose | Tailings |
| Owner | Poly Met Mining, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Last Inspection | 02/09/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN01800 |
| Federal ID | MN01800 |
| More Info | State Dam Safety Program |