Antler Reservoir Report
Nearby: Abigale Haivala #1
Last Updated: December 6, 2025
Antler is a privately-owned dam located in Harding, South Dakota, along the Tributary Fork of the Grand River.
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Summary
Constructed in 1958 by the Natural Resources Conservation Service, this earth dam stands at a height of 22 feet and stretches 420 feet in length. With a storage capacity of 114 acre-feet and a maximum discharge rate of 1260 cubic feet per second, Antler serves as a crucial water resource for the surrounding area.
Despite its age, Antler has been deemed to have a low hazard potential and its condition remains unrated. While the dam is state-regulated and undergoes regular inspections, it has not been assigned an Emergency Action Plan (EAP) or undergone a risk assessment. The dam's hazard potential, coupled with its strategic location along the Grand River tributary, underscores the importance of continued monitoring and assessment to ensure the safety and sustainability of this critical water infrastructure.
As climate change impacts water resources and infrastructure, the data on Antler highlights the importance of proactive risk management and emergency preparedness for dams across the country. With its role in providing water storage and flood control, Antler serves as a key asset in the region's water management system, emphasizing the need for ongoing maintenance and monitoring to safeguard against potential hazards and ensure the resilience of water resources in the face of a changing climate.
Year Completed |
1958 |
Dam Length |
420 |
Dam Height |
22 |
River Or Stream |
TRIB-S FORK GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
22 |
Nid Storage |
114 |
Hazard Potential |
Low |
Nid Height |
22 |
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.
Antler