Prince & Sons Number 2 Reservoir Report
Last Updated: December 6, 2025
Prince & Sons Number 2 is a privately owned earth dam located in Stanley, South Dakota, along the tributary Lance Creek.
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Summary
Constructed in 1961 by the Natural Resources Conservation Service, this dam stands at a height of 36 feet and has a storage capacity of 82 acre-feet. With a low hazard potential and a condition assessment of "Not Rated", this dam serves as a vital water resource infrastructure in the region.
Managed by the South Dakota Department of Environment and Natural Resources, Prince & Sons Number 2 is regulated, permitted, inspected, and enforced by the state agency. The dam has a maximum discharge capacity of 750 cubic feet per second and plays a critical role in flood control and water storage for the surrounding area. Despite its age, this dam continues to function effectively and safely, contributing to the overall water management efforts in South Dakota.
Located within the St. Paul District of the US Army Corps of Engineers, Prince & Sons Number 2 is a significant landmark in the region with its historical significance and engineering marvel. As climate change continues to impact water resources, this dam stands as a testament to the importance of sustainable water management practices and the need for ongoing monitoring and maintenance to ensure its continued functionality for future generations.
Year Completed |
1961 |
Dam Length |
550 |
Dam Height |
36 |
River Or Stream |
TRIB. LANCE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
36 |
Nid Storage |
82 |
Hazard Potential |
Low |
Nid Height |
36 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Prince & Sons Number 2