J.E. Sheehan Estate #1 Reservoir Report
Last Updated: December 13, 2025
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Summary
Sheehan Estate #1 is a privately-owned dam located in Stanley, South Dakota, along the Tributary Agency Creek. Constructed in 1958 by the Natural Resources Conservation Service, this earth-type dam stands at a height of 30 feet and has a length of 430 feet. With a maximum storage capacity of 58 acre-feet and a normal storage capacity of 27 acre-feet, this dam plays a crucial role in water resource management in the area.
Despite being classified as having a low hazard potential, the condition of J.E. Sheehan Estate #1 has not been officially rated. However, the dam is subject to regular inspections, permitting, and enforcement by the South Dakota Department of Environment and Natural Resources. While the dam has not been modified in recent years, it is important to ensure that proper risk management measures are in place to maintain the safety and integrity of this essential water infrastructure.
As a key structure in the region, J.E. Sheehan Estate #1 serves as a vital component in the overall water resource system, providing storage and regulation of water flow along the Tributary Agency Creek. Climate and water resource enthusiasts can appreciate the role this dam plays in ensuring water availability for various uses while also highlighting the importance of ongoing maintenance and monitoring to prevent potential risks and ensure long-term sustainability.
Year Completed |
1958 |
Dam Length |
430 |
Dam Height |
30 |
River Or Stream |
TRIB. AGENCY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Nid Storage |
58 |
Hazard Potential |
Low |
Nid Height |
30 |
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 #1