Joe Mangin Reservoir Report
Nearby: Bartels Dam Gene Rock
Last Updated: December 13, 2025
Joe Mangin is a privately owned dam located in South Dakota, specifically in Potter County along the TR-Cheyenne Creek.
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Summary
Built in 1939, this Earth dam stands at a height of 12 feet and has a storage capacity of 67 acre-feet. Despite its age, Joe Mangin is in good condition with a low hazard potential and has not been rated for its current condition.
Managed by the Natural Resources Conservation Service, Joe Mangin is regulated by the South Dakota Department of Environment and Natural Resources (DENR), with state permitting, inspection, and enforcement in place. The dam serves primarily as a water resource structure on the creek, contributing to the local ecosystem and water supply management. It is situated within the St. Paul District of the US Army Corps of Engineers jurisdiction.
While Joe Mangin may not be a high-profile dam, its role in the local water resource management is crucial. With its modest size and low hazard potential, this Earth dam continues to serve its purpose effectively, highlighting the importance of even smaller structures in our overall climate and water resource management efforts.
Year Completed |
1939 |
Dam Length |
390 |
Dam Height |
12 |
River Or Stream |
TR-CHEYENNE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
12 |
Nid Storage |
67 |
Hazard Potential |
Low |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
Grand R At Little Eagle Sd
|
47cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
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.
Joe Mangin