Bennett Number 1 Reservoir Report
Nearby: Bennett Robert No. 1 Vesely No.1
Last Updated: December 13, 2025
Bennett Number 1 is a privately owned dam located in Mellette, South Dakota, along the TRIB-WHITE RIVER.
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Summary
Constructed in 1963, this earth dam stands at a height of 28 feet and has a storage capacity of 19 acre-feet. Despite being regulated by the South Dakota Department of Environment and Natural Resources (DENR), the dam is classified as having a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment.
This dam plays a crucial role in water resource management and flood control in the region. With a maximum discharge capacity of 144 cubic feet per second, Bennett Number 1 serves to protect the surrounding area from potential flooding events. The dam's primary purpose and associated structures are not specified in the data, but its presence is essential for ensuring water security and climate resilience in the area.
While the dam's emergency action plan (EAP) status and risk assessment details are not provided, it is clear that Bennett Number 1 serves as a key infrastructure asset in South Dakota. As climate change continues to impact water resources and weather patterns, dams like Bennett Number 1 will be vital for mitigating risks and ensuring sustainable water management practices for the future.
Year Completed |
1963 |
Dam Length |
300 |
Dam Height |
28 |
River Or Stream |
TRIB-WHITE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
28 |
Nid Storage |
19 |
Hazard Potential |
Low |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White River Near White River
|
42cfs |
Little White R Below White River Sd
|
141cfs |
White R Near Oacoma Sd
|
105cfs |
Little White R Near Rosebud Sd
|
96cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
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.
Bennett Number 1