F. Joens Reservoir Report
Nearby: G.P. Joens F. Cnot Ratedtis
Last Updated: December 8, 2025
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Summary
Joens is a privately owned earth dam located in Dewey, South Dakota, along the TR MOREAU river. Completed in 1940, this dam stands at a height of 20 feet and has a storage capacity of 96 acre-feet. With a maximum discharge of 2400 cubic feet per second, it serves a primarily low hazard potential and is currently rated as "Not Rated" in terms of condition assessment.
Despite being a private structure, F. Joens is regulated and permitted by the South Dakota Department of Environment and Natural Resources (DENR). The dam is subject to state jurisdiction, inspection, and enforcement, ensuring its compliance with safety standards and regulations. The dam's purpose and associated structures are not specified, but its location and design indicate a significant role in managing water resources and climate-related impacts in the area.
In the event of emergencies, the dam's Emergency Action Plan (EAP) status is not specified, suggesting a potential area for improvement in disaster preparedness. Overall, F. Joens serves as a vital infrastructure for water management in the region, balancing the needs of water resources and climate enthusiasts while adhering to state regulations and safety standards.
Year Completed |
1940 |
Dam Length |
500 |
Dam Height |
20 |
River Or Stream |
TR MOREAU |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
96 |
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 |
Moreau R Near Faith Sd
|
14cfs |
Cheyenne R Near Plainview Sd
|
0cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
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.
F. Joens