Alvin Horman Reservoir Report
Nearby: Bergeson Dam Hedman Number 1
Last Updated: December 6, 2025
Alvin Horman, a private dam located in Stanley, South Dakota, stands as a crucial water resource structure in the region.
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Summary
Built in 1960 by the Natural Resources Conservation Service, this earth dam spans 550 feet in length and reaches a height of 26 feet, with a storage capacity of 32 acre-feet. Situated on the tributary of Plum Creek, this dam plays a vital role in managing water flow and storage in the area, contributing to the overall water resource management efforts in South Dakota.
Despite its low hazard potential, Alvin Horman is regulated and inspected by the South Dakota Department of Environment and Natural Resources, ensuring its safety and structural integrity. The dam has a maximum discharge capacity of 1200 cubic feet per second, further highlighting its significance in flood control and water management. While its condition is currently rated as "Not Rated," ongoing inspections and maintenance ensure that the dam continues to serve its purpose effectively and safely for the surrounding community.
With Dusty Johnson (R) as the representative of the area in Congress, there is a strong emphasis on environmental stewardship and sustainable water resource management. Alvin Horman serves as a testament to the collaborative efforts between the private sector, government agencies, and local communities to safeguard water resources and mitigate the impact of climate change in South Dakota. As climate enthusiasts, monitoring and supporting structures like Alvin Horman are essential in ensuring the resilience and sustainability of water resources for future generations.
Year Completed |
1960 |
Dam Length |
550 |
Dam Height |
26 |
River Or Stream |
TRIB. PLUM CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
32 |
Hazard Potential |
Low |
Nid Height |
26 |
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.
Alvin Horman