Marsh Dam Reservoir Report
Nearby: Ward Dam Sd Noname 13
Last Updated: December 5, 2025
Marsh Dam, located in Pennington, South Dakota, is a privately owned structure that serves as a crucial water resource on Antelope Creek.
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Summary
Completed in 1981, this earth dam stands at 18 feet high and has a storage capacity of 144 acre-feet, with a maximum discharge rate of 3800 cubic feet per second. Despite its low hazard potential, the dam's condition has not been officially rated, highlighting the need for regular inspections and maintenance to ensure its continued safety and functionality.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Marsh Dam is subject to state regulation and inspection, underscoring the commitment to environmental stewardship and public safety. While specific purposes for the dam are not listed, its presence plays a vital role in water management and conservation efforts in the region. With Dusty Johnson (R) representing the area in Congress, there is a direct link between local water resource infrastructure and federal oversight, ensuring that the dam meets necessary standards and guidelines.
As a key component of the water infrastructure in the area, Marsh Dam contributes to the overall resilience of the region in the face of climate change and fluctuating water levels. While its exact risk assessment and emergency preparedness measures are not detailed, the dam's presence as a regulated structure underscores the importance of proactive management and monitoring. With its strategic location and modest size, Marsh Dam stands as a testament to the collaborative efforts between private owners, state agencies, and federal representatives to safeguard water resources and mitigate potential risks in the face of a changing climate.
Year Completed |
1981 |
Dam Length |
360 |
Dam Height |
18 |
River Or Stream |
ANTELOPE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
144 |
Hazard Potential |
Low |
Nid Height |
18 |
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.
Marsh Dam