H.G. Horman Dam No.1 Reservoir Report
Nearby: Horman Dam Guidinger Dam
Last Updated: December 5, 2025
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Summary
Horman Dam No.1, located in Butte, South Dakota, is a privately owned earth dam built in 1958 across the Horman Draw river. The dam stands at a height of 17 feet and has a length of 710 feet, providing a storage capacity of 156 acre-feet with a normal storage level of 98 acre-feet. The dam serves multiple purposes including water resource management, flood control, and irrigation for the surrounding area.
Despite being classified as a low hazard potential structure, the dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) with state permitting, inspection, and enforcement in place. The Natural Resources Conservation Service was involved in the design of the dam. With a maximum discharge capacity of 1470 cubic feet per second, the H.G. Horman Dam No.1 plays a crucial role in water management in the region, ensuring water security and safety for the local community.
Although the condition assessment of the dam is currently marked as "Not Rated," the structure has not undergone recent inspections or assessments. Emergency action plans and risk management measures have not been fully documented or updated for the dam. However, with its strategic location and storage capacity, the H.G. Horman Dam No.1 remains a key infrastructure for water resource enthusiasts and climate advocates in South Dakota.
Year Completed |
1958 |
Dam Length |
710 |
Dam Height |
17 |
River Or Stream |
HORMAN DRAW |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Nid Storage |
156 |
Hazard Potential |
Low |
Nid Height |
17 |
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.
H.G. Horman Dam No.1
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