Foster Number 4 Reservoir Report
Nearby: Foster Number 2 Foster Number 3
Last Updated: December 8, 2025
Located in Fort Pierre, South Dakota, Foster Number 4 is a privately owned earth dam that was completed in 1952 by the Natural Resources Conservation Service.
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Summary
This dam stands at a height of 31 feet and has a length of 640 feet, providing a storage capacity of 120 acre-feet. It is situated on the TR-BAD RIVER and is regulated by the South Dakota Department of Environment and Natural Resources.
With a low hazard potential and a condition assessment of "Not Rated," Foster Number 4 plays a crucial role in water resource management in the area. Despite not being rated for condition, the dam is inspected, permitted, and regulated by the state agency to ensure its safe operation and maintenance. The dam's primary purpose and associated structures are not specified, but it serves as a vital infrastructure for flood control and water supply in Jones County, South Dakota.
While Foster Number 4 has not been assigned an Emergency Action Plan (EAP) or undergone recent risk assessments, its ownership and operation fall under the responsibility of the private entity. The dam's emergency preparedness, risk management measures, and potential impacts are essential considerations for water resource and climate enthusiasts interested in the sustainability and resilience of infrastructure like Foster Number 4 in the face of changing environmental conditions.
Year Completed |
1952 |
Dam Length |
640 |
Dam Height |
31 |
River Or Stream |
TR-BAD RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
31 |
Nid Storage |
120 |
Hazard Potential |
Low |
Nid Height |
31 |
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.
Foster Number 4