Dejong Bros 5 Reservoir Report
Nearby: Dejong Bros 2 Dejong Bros 4
Last Updated: December 13, 2025
Dejong Bros 5 is a privately owned dam located in Tripp, South Dakota, along the White River off-stream.
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Summary
Constructed in 1961, this earth dam stands at 27 feet high and spans a length of 480 feet, providing a maximum storage capacity of 68 acre-feet. The dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and is subject to regular inspections, permitting, and enforcement to ensure its safety and compliance with state regulations.
Managed by the Natural Resources Conservation Service, Dejong Bros 5 has a low hazard potential and has not been rated for its current condition. Despite its age, the dam continues to serve its purpose effectively, with a normal storage capacity of 28 acre-feet and a maximum discharge rate of 1806 cubic feet per second. While there are no associated structures or emergency action plans in place for this dam, its location along the White River highlights its importance in managing water resources in the region. For water resource and climate enthusiasts, Dejong Bros 5 presents a unique opportunity to study the intersection of infrastructure, regulation, and environmental stewardship in South Dakota.
Year Completed |
1961 |
Dam Length |
480 |
Dam Height |
27 |
River Or Stream |
WHITE RIVER OFF STREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
68 |
Hazard Potential |
Low |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White R Near Oacoma Sd
|
105cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
Keya Paha R At Wewela Sd
|
54cfs |
White River Near White River
|
42cfs |
Platte Creek Near Platte
|
3cfs |
Little White R Below White River Sd
|
141cfs |
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 5