Erwin Eisenbraun Reservoir Report
Nearby: Sd Noname 178 Lewis Dam
Last Updated: December 6, 2025
Erwin Eisenbraun is a private earth dam located in Pennington, South Dakota, along the TR-CHEYENNE river.
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Summary
Built in 1948, this dam stands at a height of 16 feet and has a length of 700 feet, providing a storage capacity of 70 acre-feet. While it is primarily regulated by the South Dakota Department of Environment and Natural Resources (DENR), it is not currently rated for its condition assessment, and its hazard potential is classified as low.
Managed by the Natural Resources Conservation Service, Erwin Eisenbraun serves various purposes such as water resource management and flood control. Despite not having a defined primary purpose, the dam's construction plays a vital role in maintaining the normal storage capacity of 45 acre-feet and ensuring a maximum discharge of 565 cubic feet per second. As a critical infrastructure in the region, the dam's condition, emergency action plan preparedness, and risk assessment measures should be closely monitored and updated to mitigate any potential risks and ensure its long-term sustainability for water resource and climate enthusiasts to appreciate and study.
Year Completed |
1948 |
Dam Length |
700 |
Dam Height |
16 |
River Or Stream |
TR-CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Nid Storage |
70 |
Hazard Potential |
Low |
Nid Height |
16 |
Seasonal Comparison
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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.
Erwin Eisenbraun