Holsti Dam Reservoir Report
Nearby: Mud Butte Evenson North Irrigation
Last Updated: December 5, 2025
Holsti Dam, located in Harding, South Dakota, was completed in 1954 and stands at a height of 15 feet with a length of 420 feet.
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Summary
This earth dam, managed by a private owner, serves as a vital water resource structure on the TRIB-LITTLE MISSONot RatedI river or stream. With a storage capacity of 150 acre-feet and a maximum discharge of 630 cfs, the dam contributes to flood control and water management in the region.
Despite being classified as having a low hazard potential, Holsti Dam is regulated and inspected by the South Dakota Department of Environment and Natural Resources (DENR). The dam's condition is currently assessed as "Not Rated," indicating a need for ongoing monitoring and maintenance. While the dam's Emergency Action Plan (EAP) status and risk assessment details are not specified in the available data, the dam remains a critical infrastructure piece for water supply and management in the area, demonstrating the importance of continued oversight and risk management measures to ensure its safety and functionality for the community.
Managed by the Natural Resources Conservation Service, Holsti Dam plays a crucial role in water resource management in South Dakota. With its primary purpose and specific functions not clearly outlined in the data, the dam's design and construction reflect a commitment to sustainable water infrastructure. As climate change impacts continue to affect water resources, the maintenance and regulation of structures like Holsti Dam are vital for ensuring water security and resilience in the face of evolving environmental challenges.
Year Completed |
1954 |
Dam Length |
420 |
Dam Height |
15 |
River Or Stream |
TRIB-LITTLE MISSONot RatedI |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
150 |
Hazard Potential |
Low |
Nid Height |
15 |
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.
Holsti Dam