Jensen No.10 Reservoir Report
Nearby: Greene No.2 Greene Gene No.2
Last Updated: December 13, 2025
Jensen No.10 is a privately owned earth dam located in Mellette, South Dakota, with a height of 22 feet and a length of 526 feet.
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Summary
Completed in 1955, this dam has a storage capacity of 79 acre-feet and a low hazard potential. It is regulated by the South Dakota Department of Environment and Natural Resources, with state permitting, inspection, and enforcement in place to ensure its safety and compliance with regulations.
Situated near the TR Cottonwood Creek offstream, Jensen No.10 serves as a vital water resource for the surrounding area, providing storage for irrigation and other agricultural purposes. Despite not being rated for its condition assessment, the dam continues to serve its primary purpose effectively. With a maximum discharge capacity of 216 cubic feet per second, this structure plays a crucial role in managing water flow and mitigating the risk of flooding in the region.
While Jensen No.10 may not have a designated emergency action plan or updated hazard assessment, its low hazard potential and solid construction highlight its reliability in safeguarding the community from potential threats. As a key component of water resource management in South Dakota, this dam stands as a testament to the importance of infrastructure in adapting to and mitigating the impacts of climate change on local ecosystems and communities.
Year Completed |
1955 |
Dam Length |
526 |
Dam Height |
22 |
River Or Stream |
TR COTTONWOOD CR OFFSTREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
22 |
Nid Storage |
79 |
Hazard Potential |
Low |
Nid Height |
22 |
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.10