Nspc Stage 2 Tailings Reservoir Report
Nearby: Reservoir No. 6 Nspc Initial Tailings
Last Updated: December 14, 2025
Nspc Stage 2 Tailings, also known as Keetac, is a private-owned tailings structure located in Pengilly, Minnesota.
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Summary
This earth dam, completed in 1978, stands at a height of 30 feet and spans 25,300 feet in length. With a storage capacity of 10,000 acre-feet and a normal storage of 2,100 acre-feet, it plays a crucial role in managing the tailings from mining operations in the area.
Situated in the St. Louis County, Minnesota, the Nspc Stage 2 Tailings structure holds a significant hazard potential, but its condition is assessed as fair as of August 2015. The dam is regulated by the Minnesota Department of Natural Resources (MNDNR EWR) and undergoes inspections every 4 years to ensure its safety and compliance with state regulations. Despite its age, the dam continues to serve its primary purpose effectively, highlighting the importance of proper maintenance and monitoring of water resource infrastructure in the face of changing climate conditions.
For water resource and climate enthusiasts, Nspc Stage 2 Tailings offers a fascinating case study in the management of mining-related tailings structures. Its location along the Hay Creek-OS river stream and its significant storage capacity make it a critical piece of infrastructure in the region. With its history dating back to the late 1970s, the dam serves as a reminder of the ongoing challenges and responsibilities associated with maintaining and monitoring water resources amidst a changing climate landscape.
Year Completed |
1978 |
Dam Length |
25300 |
Dam Height |
20 |
River Or Stream |
HAY CREEK-OS |
Primary Dam Type |
Earth |
Drainage Area |
9.3 |
Nid Storage |
10000 |
Structural Height |
30 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Prairie River Near Taconite
|
63cfs |
Mississippi River At Grand Rapids
|
639cfs |
St. Louis River At Scanlon
|
693cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Nspc Stage 2 Tailings
O'Brien Reservoir