J.B. Mcginnis Reservoir Report
Nearby: Wayne Kennedy Grady Wilson Jr.
Last Updated: December 7, 2025
J.B.
°F
°F
mph
Wind
%
Humidity
Summary
Mcginnis is a private earth dam located in Perkins, South Dakota, along the TR Moreau River. Built in 1946, this dam has a height of 20 feet and a length of 250 feet, providing a storage capacity of 105 acre-feet. With a maximum discharge of 300 cubic feet per second, this low hazard potential structure is regulated by the South Dakota Department of Environment and Natural Resources.
Managed by the Natural Resources Conservation Service, J.B. Mcginnis plays a crucial role in water resource management in the region, offering flood control and water storage benefits. Despite its age, the dam's condition is currently not rated, with no recent inspection data available. Located within the St. Paul District of the US Army Corps of Engineers, this dam contributes to the overall water infrastructure in the area, ensuring the safety and sustainability of water resources for the community.
With its strategic location and key role in water management along the TR Moreau River, J.B. Mcginnis stands as a significant asset in South Dakota's water resource infrastructure. As climate change continues to impact water availability and quality, structures like J.B. Mcginnis become increasingly vital for addressing water-related challenges and ensuring a reliable water supply for both current and future generations.
Year Completed |
1946 |
Dam Length |
250 |
Dam Height |
20 |
River Or Stream |
TR MOREAU RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
105 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
J.B. Mcginnis