John Gesinger No.1 Reservoir Report
Nearby: Joe Gesinger No.1 C.J. Larson No.1
Last Updated: December 13, 2025
John Gesinger No.1 is a privately owned earth dam located in Dewey, South Dakota, along the TR MOREAU river.
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Summary
Constructed in 1940, this dam stands at a height of 20 feet and has a storage capacity of 112 acre-feet. With a maximum discharge of 1200 cubic feet per second, this dam serves as a vital structure for water resource management in the area.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), John Gesinger No.1 is regulated, inspected, and enforced by the state authorities to ensure its safe operation. Despite being classified as having a low hazard potential, the dam's condition assessment is currently marked as "Not Rated". While details on emergency action preparedness and risk management measures are not provided, it is clear that this dam plays a crucial role in water management in the region.
Although limited information is available regarding the dam's associated structures, maintenance history, and emergency preparedness, John Gesinger No.1 remains a key feature in the water infrastructure of South Dakota. With its historical significance and role in managing water resources along the TR MOREAU river, this dam serves as a reminder of the importance of maintaining and monitoring critical infrastructure in the face of changing climate patterns and water resource demands.
Year Completed |
1940 |
Dam Length |
500 |
Dam Height |
20 |
River Or Stream |
TR MOREAU |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
112 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Grand R At Little Eagle Sd
|
47cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
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.
John Gesinger No.1