Smith No.1 Reservoir Report
Nearby: Gregorson No.1 Rasmussen No.1
Last Updated: December 5, 2025
Smith No.1 is a privately owned earth dam located in Custer, South Dakota, along the TR-CHEYENNE river.
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Summary
Constructed in 1972 by the Natural Resources Conservation Service, this dam stands at 28 feet tall with a length of 420 feet, providing a maximum storage capacity of 112 acre-feet. With a significant hazard potential, Smith No.1 is regulated by the South Dakota Department of Environment and Natural Resources and undergoes regular state inspections, enforcement, and permitting to ensure its safety and compliance.
Although the dam's condition assessment is currently not rated, its emergency action plan status and risk management measures are unspecified. It is situated within the jurisdiction of the state and is subject to state regulations. The dam's location in the Omaha District underlines its importance for water resource management within the region. With a maximum discharge capacity of 2635 cubic feet per second, Smith No.1 plays a crucial role in flood control and water supply for the surrounding area, highlighting its significance for the local community and ecosystem.
Year Completed |
1972 |
Dam Length |
420 |
Dam Height |
28 |
River Or Stream |
TR-CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
112 |
Hazard Potential |
Significant |
Nid Height |
28 |
Seasonal Comparison
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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.
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Smith No.1