Nspc Initial Tailings
Nspc Initial Tailings is an earth dam located in St. Louis County, Minnesota, built in 1968. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Nspc Initial Tailings
The primary purpose of Nspc Initial Tailings 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 Us Steel (private). It impounds the Swan River-os near Pengilly.
The dam stands 45 feet tall and stretches 24,100 feet across, has a maximum storage capacity of 1,050 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1968, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/29/2021.
At 45 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Minnesota |
| County | St. Louis |
| Nearest City | Pengilly |
| River/Stream | Swan River-os |
| Coordinates | 47.37340, -93.05881 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 24,100 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 1,050 acre-ft |
| Max Storage | 1,050 acre-ft |
| Normal Storage | 160 acre-ft |
| Drainage Area | 3 sq mi |
| Max Discharge | 124 cfs |
Ownership & Safety
| Purpose | Tailings |
| Owner | US Steel |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/29/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00800 |
| Federal ID | MN00800 |
| More Info | State Dam Safety Program |