Delzer No.1 Reservoir Report
Nearby: Delzer No.2 Delzer No.3
Last Updated: December 5, 2025
Delzer No.1 is a privately owned earth dam located on Hilderbrand Creek in Butte, South Dakota.
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Summary
Completed in 1957, this dam stands at a height of 27 feet and has a maximum storage capacity of 358 acre-feet, with a normal storage capacity of 214 acre-feet. The dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment.
The dam is under state regulation by the South Dakota Department of Environment and Natural Resources (DENR), with state permitting, inspection, and enforcement in place. The structure is located in the Omaha District of the US Army Corps of Engineers and is not associated with any federal agencies in terms of ownership, funding, design, construction, or operations. Despite being privately owned, Delzer No.1 plays a crucial role in water resource management in the area, with a maximum discharge capacity of 800 cubic feet per second.
For water resource and climate enthusiasts, Delzer No.1 serves as an interesting case study of a privately owned dam in a state-regulated environment. With its historical significance and importance in water storage and management, this dam provides valuable insights into the intersection of private ownership, state regulation, and the role of dams in mitigating water-related risks and hazards.
Year Completed |
1957 |
Dam Length |
1850 |
Dam Height |
27 |
River Or Stream |
HILDERBRAND CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
24 |
Nid Storage |
358 |
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.
Delzer No.1