Reservoir No. 6
Reservoir No. 6 is an earth dam located in Itasca County, Minnesota, built in 1966. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Reservoir No. 6
The primary purpose of Reservoir No. 6 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 O'brien Creek-tr near Pengilly.
The dam stands 40 feet tall and stretches 4,050 feet across, has a maximum storage capacity of 3,500 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1966, 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 40 feet, this dam is taller than 87% of dams nationwide.
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Location
| State | Minnesota |
| County | Itasca |
| Nearest City | Pengilly |
| River/Stream | O'brien Creek-tr |
| Coordinates | 47.35996, -93.09129 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 35 ft |
| Dam Length | 4,050 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 3,500 acre-ft |
| Max Storage | 3,500 acre-ft |
| Normal Storage | 2,600 acre-ft |
| Drainage Area | 0 sq mi |
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 | MN00798 |
| Federal ID | MN00798 |
| More Info | State Dam Safety Program |