J.E. Sheehan Estate #3 Reservoir Report
Last Updated: December 13, 2025
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Summary
Sheehan Estate #3 is a privately owned dam located in Stanley, South Dakota, with a low hazard potential and a height of 25 feet. Completed in 1960, this earth dam has a storage capacity of 33 acre-feet and a maximum discharge rate of 750 cubic feet per second. Managed by the Natural Resources Conservation Service, this dam is regulated and inspected by the South Dakota Department of Environment and Natural Resources, ensuring its safety and compliance with state regulations.
Situated on a tributary of the Missouri River, J.E. Sheehan Estate #3 plays a crucial role in water resource management in the region. While the dam's condition assessment is currently not rated, its emergency action plan status and risk assessment measures are yet to be determined. With a primary purpose that is unspecified, this dam serves important functions in flood control, irrigation, and water conservation, contributing to the overall environmental sustainability and resilience of the area.
Maintaining a close eye on J.E. Sheehan Estate #3 is essential for water resource and climate enthusiasts, as it represents a key infrastructure that impacts the local ecosystem and water supply. With its historical significance dating back to the 1960s, this dam continues to be a vital component of the region's water infrastructure, ensuring the efficient management of water resources and protection against potential hazards. As efforts to assess and improve the dam's safety and emergency preparedness continue, it remains a focal point for those interested in sustainable water management practices and climate resilience strategies.
Year Completed |
1960 |
Dam Length |
450 |
Dam Height |
25 |
River Or Stream |
TRIB. MISSONot RatedI RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
33 |
Hazard Potential |
Low |
Nid Height |
25 |
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.
J.E. Sheehan Estate #3