Jensen No. 4 Reservoir Report
Nearby: Raffensperger No. 1 Bucholz Number 1
Last Updated: December 8, 2025
Jensen No.
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Summary
4 is a privately owned earth dam located in Mellette, South Dakota, along the tributary of Pine Creek. Built in 1964, this dam stands at a height of 25 feet and has a storage capacity of 17 acre-feet. With a low hazard potential and a condition assessment of "Not Rated," Jensen No. 4 is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and undergoes regular state inspections and enforcement measures to ensure its safety and compliance.
Situated within the St. Paul District of the US Army Corps of Engineers jurisdiction, Jensen No. 4 plays a crucial role in water resource management and flood control in the region. Despite its smaller size compared to other dams, its strategic location and design make it an integral part of the local water infrastructure. With a maximum discharge capacity of 475 cubic feet per second, this dam contributes to the overall resilience of the area against potential water-related challenges.
As a key component of the state's water management system, Jensen No. 4 serves as a testament to the importance of private ownership in sustaining and safeguarding water resources. Its presence not only mitigates flood risks but also supports various ecological functions in the region. With ongoing state regulation and enforcement measures in place, Jensen No. 4 continues to be a reliable asset for water supply, irrigation, and environmental protection in Mellette, South Dakota.
Year Completed |
1964 |
Dam Length |
260 |
Dam Height |
25 |
River Or Stream |
TRIB-PINE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
17 |
Hazard Potential |
Low |
Nid Height |
25 |
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.
Jensen No. 4