Greene No.2 Reservoir Report
Nearby: Jensen No.10 Rada Roy No.1
Last Updated: December 13, 2025
Greene No.2 is a privately owned earth dam located in Mellette, South Dakota, along a tributary of Cottonwood Creek.
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Summary
Built in 1968, this dam stands at a height of 26 feet and has a storage capacity of 27 acre-feet. With a low hazard potential and a condition assessment of "Not Rated," Greene No.2 plays a crucial role in water resource management in the area. Despite its age, the dam is regulated and inspected by the South Dakota Department of Environment and Natural Resources, ensuring its safety and functionality.
Managed by a private owner, Greene No.2 is not only an important water resource structure but also a key component of the local ecosystem. Its presence contributes to flood control, water supply maintenance, and overall environmental sustainability in the region. Although the dam has not been rated for condition assessment, its low hazard potential indicates that it is a reliable infrastructure that continues to serve its intended purposes effectively.
As a part of the St. Paul District under the US Army Corps of Engineers, Greene No.2 stands as a testament to the collaborative efforts between private owners and regulatory agencies in ensuring the safe operation of critical water infrastructure. With proper inspection, enforcement, and permitting procedures in place, this dam remains a vital component of the water management system in South Dakota, safeguarding against potential risks and supporting the local community's water needs.
Year Completed |
1968 |
Dam Length |
528 |
Dam Height |
26 |
River Or Stream |
TRIB. COTTONWOOD CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
27 |
Hazard Potential |
Low |
Nid Height |
26 |
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.
Greene No.2