A. Herron No.1 Reservoir Report
Nearby: R. Fields No.5 Herron Dam
Last Updated: December 6, 2025
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Summary
Herron No.1 is a privately owned earth dam located in Ziebach, South Dakota, along the TR CHEYENNE river. Completed in 1940, this dam stands at a height of 15 feet and spans a length of 600 feet, with a storage capacity of 174 acre-feet. Despite its age, the dam is considered to have low hazard potential and has not been rated for its condition assessment.
The dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR), with state jurisdiction and permitting in place. It is regularly inspected, enforced, and meets state regulatory guidelines. The primary purpose of A. Herron No.1 is not specified, and there are no associated structures or federal agency involvement with this dam. The risk assessment, emergency action plan, and inundation maps for this dam are all currently not available.
In terms of environmental impact and climate resilience, A. Herron No.1 serves as a key water resource management infrastructure in the area. With its low hazard potential and state-regulated operations, this dam plays a crucial role in flood control, water storage, and overall ecosystem health along the TR CHEYENNE river in South Dakota. Understanding the condition and maintenance of A. Herron No.1 is essential for water resource and climate enthusiasts looking to support sustainable water management practices in the region.
Year Completed |
1940 |
Dam Length |
600 |
Dam Height |
15 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
174 |
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.
A. Herron No.1