Sammons No.2 Reservoir Report
Nearby: Sammons Tribe No.4
Last Updated: December 7, 2025
Sammons No.2 is a privately owned dam located on the TR MOREAU river in South Dakota, specifically in Ziebach County.
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Summary
Constructed in 1958 by the Natural Resources Conservation Service, this earth-type dam stands at 27 feet in height and spans 240 feet in length. With a storage capacity of 146 acre-feet and a maximum discharge rate of 3965 cubic feet per second, Sammons No.2 serves as a crucial structure for water resource management in the region.
Despite its age, Sammons No.2 is classified as having low hazard potential and has not been rated for its current condition. The dam is regulated and inspected by the South Dakota Department of Environment and Natural Resources, ensuring its compliance with state regulations and safety standards. With no associated structures and no recent inspection data available, the maintenance and upkeep of Sammons No.2 remain essential to prevent any potential risks or hazards in the future.
For water resource and climate enthusiasts, Sammons No.2 provides a fascinating case study of a historic dam that continues to play a vital role in managing water resources in South Dakota. Its location on the TR MOREAU river, along with its low hazard potential and state regulation, highlight the importance of maintaining and monitoring aging infrastructure to ensure the safety and sustainability of water systems in the region.
Year Completed |
1958 |
Dam Length |
240 |
Dam Height |
27 |
River Or Stream |
TR MOREAU |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
146 |
Hazard Potential |
Low |
Nid Height |
27 |
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.
Sammons No.2