Chisholm Number 1 Reservoir Report
Last Updated: December 13, 2025
Chisholm Number 1 is a privately owned earth dam located in Stanley, South Dakota, completed in 1967.
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Summary
Managed by the Natural Resources Conservation Service, this dam stands at a height of 27 feet and has a storage capacity of 72 acre-feet. Despite its low hazard potential and not yet rated condition assessment, Chisholm Number 1 is regulated by the South Dakota Department of Environment and Natural Resources, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.
Situated off-stream along the MISSONot RatedI river or stream, Chisholm Number 1 plays a crucial role in water resource management in the region. Its primary purpose and specific design features are not explicitly stated, but its construction and maintenance are overseen by state and federal agencies. With a maximum discharge capacity of 1000 cubic feet per second, this dam helps to control water flow and prevent flooding in the area, contributing to the overall resilience of the local water infrastructure.
As a key component of the water management system in South Dakota, Chisholm Number 1 provides valuable storage capacity and flood control benefits to the surrounding community. With a focus on safety and regulatory compliance, this earth dam serves as a vital resource for both water supply and climate resilience efforts in the region. Its strategic location, design, and management make it an essential asset for protecting against potential water-related hazards and ensuring sustainable water resource management in the area.
Year Completed |
1967 |
Dam Length |
531 |
Dam Height |
27 |
River Or Stream |
MISSONot RatedI OFF STREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
72 |
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.
Chisholm Number 1