Mickelson Memorial Marsh South Dam Reservoir Report
Last Updated: December 13, 2025
Mickelson Memorial Marsh South Dam, located in Hamlin, South Dakota, is a state-regulated structure built in 1994 with a primary purpose that is not specified in the data provided.
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Summary
The dam, standing at a height of 8 feet and a length of 750 feet, serves as a vital component in managing water resources in the area, specifically along the TRIB. BIG SIOUX RIVER. With a maximum storage capacity of 500 acre-feet and a normal storage level of 143 acre-feet, the dam plays a crucial role in flood control and water management in the region.
Although the dam is classified as having a low hazard potential, its risk assessment is rated as moderate (3), emphasizing the importance of continued monitoring and maintenance. Despite not being rated for condition assessment, the dam is inspected, permitted, and regulated by the South Dakota Department of Environment and Natural Resources (DENR). With Dusty Johnson (R) as the Congressional Representative for the area, the dam's safety and functionality are closely monitored to ensure the protection of surrounding communities and ecosystems in the event of an emergency.
As an Earth-type dam with an uncontrolled spillway, Mickelson Memorial Marsh South Dam serves as a critical infrastructure for water resource management in South Dakota. With its strategic location and design, the dam plays a key role in safeguarding against potential flooding and ensuring the sustainable use of water resources in the region. As water resource and climate enthusiasts, understanding and monitoring the status of structures like Mickelson Memorial Marsh South Dam is essential for promoting resilience and sustainability in the face of changing environmental conditions.
Year Completed |
1994 |
Dam Length |
750 |
Dam Height |
8 |
River Or Stream |
TRIB. BIG SIOUX RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
8 |
Drainage Area |
8 |
Nid Storage |
500 |
Outlet Gates |
None |
Hazard Potential |
Low |
Nid Height |
8 |
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.
Mickelson Memorial Marsh South Dam
458th Avenue Hamlin County