Dejong Bros 4 Reservoir Report
Nearby: Dejong Bros 2 Dejong Bros 3
Last Updated: December 13, 2025
Dejong Bros 4, located in Tripp, South Dakota, is a privately owned earth dam completed in 1961 with a primary purpose that remains unspecified.
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Summary
This structure, standing at a height of 26 feet and stretching 246 feet in length, serves as an off-stream reservoir for the White River. Managed by the South Dakota Department of Environment and Natural Resources, Dejong Bros 4 is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and compliance with regulations.
Despite its low hazard potential and "Not Rated" condition assessment, Dejong Bros 4 holds a storage capacity of 52 acre-feet, with a normal storage level of 12 acre-feet. The dam has a maximum discharge capacity of 483 cubic feet per second, aiding in flood control and water resource management for the region. While the structure's Emergency Action Plan status and risk assessment details are currently undisclosed, the presence of state oversight and maintenance measures underscores the importance of this dam in safeguarding the surrounding community and water resources.
As an integral part of the St. Paul District's infrastructure, Dejong Bros 4 stands as a testament to the collaboration between private owners and government agencies in ensuring the effective management of water resources and climate resilience. With ongoing monitoring and maintenance efforts, this earth dam continues to play a crucial role in mitigating flood risks and supporting sustainable water management practices in South Dakota.
Year Completed |
1961 |
Dam Length |
246 |
Dam Height |
26 |
River Or Stream |
WHITE RIVER OFF STREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
52 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White R Near Oacoma Sd
|
105cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
White River Near White River
|
42cfs |
Keya Paha R At Wewela Sd
|
54cfs |
Little White R Below White River Sd
|
141cfs |
Platte Creek Near Platte
|
3cfs |
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.
Dejong Bros 4