Marty Mission Reservoir Report
Nearby: Fort Randall Dam Lake Wagner Dam
Last Updated: December 13, 2025
Marty Mission, a state-regulated dam located in South Dakota along Seven Mile Creek, was completed in 1938 with a primary purpose of controlling water flow and providing storage capabilities.
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Summary
This Earth-type dam stands at 65 feet in height and spans 750 feet in length, with a storage capacity of 150 acre-feet. Despite being classified as having a low hazard potential, the dam's condition remains unrated, signaling a need for further assessment and maintenance.
Owned and regulated by the South Dakota Department of Environment and Natural Resources (DENR), Marty Mission is equipped with state permitting, inspection, and enforcement protocols to ensure its safety and compliance. In the event of an emergency, the dam's Emergency Action Plan (EAP) status and risk management measures remain unspecified, indicating potential areas for improvement in preparedness and response strategies.
With a conservative hazard potential and unspecified condition assessment, Marty Mission presents an opportunity for water resource and climate enthusiasts to engage in monitoring and advocacy efforts. By understanding the dam's structural details, regulatory framework, and emergency response protocols, stakeholders can contribute to the ongoing safety and sustainability of this crucial water management infrastructure in Charles Mix, South Dakota.
Year Completed |
1938 |
Dam Length |
750 |
Dam Height |
65 |
River Or Stream |
SEVEN MILE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
65 |
Nid Storage |
150 |
Hazard Potential |
Low |
Nid Height |
65 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Ponca Creek At Verdel
|
23cfs |
Niobrara River Nr. Verdel
|
517cfs |
Platte Creek Near Platte
|
3cfs |
Bazile Creek Near Niobrara
|
192cfs |
Verdigre C Nr Verdigre
|
206cfs |
Bazile Creek At Center
|
85cfs |
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.
Marty Mission
Spillway Drive Pickstown