Prince Irrigation Dam #2 Reservoir Report
Last Updated: December 6, 2025
Located in Stanley, South Dakota, the Prince Irrigation Dam #2 is a privately owned structure that plays a crucial role in water resource management in the region.
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Summary
Constructed in 1976, this earth dam stands at a height of 46 feet and has a storage capacity of 1100 acre-feet, with a normal storage level of 450 acre-feet. Situated on the East Fork Lance Creek, this dam serves as a vital piece of infrastructure for regulating water flow and providing irrigation to surrounding agricultural lands.
Despite its significance, the Prince Irrigation Dam #2 is classified as having a "Significant" hazard potential, emphasizing the importance of regular inspections and maintenance. While the last inspection took place in 1991, the dam remains in a "Not Rated" condition assessment status. Given its age and potential risks, there is a need for updated assessments, emergency action plans, and risk management measures to ensure the safety and efficiency of this essential water resource structure.
As climate change continues to impact water resources and infrastructure, the Prince Irrigation Dam #2 stands as a reminder of the critical role that dams play in managing water supply and mitigating risks. With a maximum discharge capacity of 3500 cubic feet per second, this dam serves as a crucial component in the local water management system. As such, continued monitoring and investment in maintenance and upgrades are essential to safeguarding this vital water resource for the community and the environment.
Year Completed |
1976 |
Dam Length |
800 |
Dam Height |
46 |
River Or Stream |
EAST FORK LANCE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
46 |
Nid Storage |
1100 |
Hazard Potential |
Significant |
Nid Height |
46 |
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 Irrigation Dam #2