Lewellan Engelhardt Reservoir Report
Nearby: Two Buttes Dam Beryl Veal
Last Updated: December 7, 2025
Lewellan Engelhardt is a privately owned earth dam located in Perkins, South Dakota, along the TR-MOREAU RIVER.
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Summary
Built in 1951 by the Natural Resources Conservation Service, this dam stands at a height of 21 feet and has a length of 700 feet. With a storage capacity of 134 acre-feet, it serves the primary purpose of water resource management in the area.
Managed by the South Dakota Department of Environment and Natural Resources, Lewellan Engelhardt is regulated, permitted, inspected, and enforced by the state. Despite its low hazard potential and current "Not Rated" condition assessment, the dam plays a crucial role in controlling water flow and providing irrigation water to the local community. With a maximum discharge of 750 cubic feet per second, the dam ensures the safety and stability of the surrounding area.
Although lacking in detailed risk assessment and emergency preparedness information, Lewellan Engelhardt remains a vital infrastructure for water resource management in the region. With its historical significance and contribution to the local ecosystem, this dam serves as a testament to the intersection of water resource management and climate resilience efforts in South Dakota.
Year Completed |
1951 |
Dam Length |
700 |
Dam Height |
21 |
River Or Stream |
TR-MOREAU RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Nid Storage |
134 |
Hazard Potential |
Low |
Nid Height |
21 |
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.
Lewellan Engelhardt