Sd Noname 20 Reservoir Report
Nearby: Boydston Dam Sd Noname 111
Last Updated: December 5, 2025
Sd Noname 20 is a privately owned dam located in Pennington, South Dakota, along the TR-BOX ELDER CREEK.
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Summary
Constructed in 1963 by the Natural Resources Conservation Service, this earth dam stands at a height of 23 feet and has a length of 360 feet. With a storage capacity of 165 acre-feet, the dam serves the primary purpose of flood control and water resource management in the area.
Despite being state-regulated and inspected, the dam is classified as having a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. The dam also has a maximum discharge capacity of 1260 cubic feet per second, ensuring efficient water flow during periods of heavy rainfall. While the dam has not been modified in recent years, it remains an essential infrastructure for maintaining the water supply and protecting the surrounding community from potential flooding events.
Overall, Sd Noname 20 represents a crucial piece of infrastructure in South Dakota's water resource management system. With its strategic location along TR-BOX ELDER CREEK and its continued state oversight, the dam plays a vital role in safeguarding the local area from the impacts of extreme weather events and ensuring a reliable water supply for the region. As climate change continues to influence weather patterns, the maintenance and monitoring of dams like Sd Noname 20 will be essential in mitigating risks and preserving the resilience of water resources in South Dakota.
Year Completed |
1963 |
Dam Length |
360 |
Dam Height |
23 |
River Or Stream |
TR-BOX ELDER CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
23 |
Nid Storage |
165 |
Hazard Potential |
Low |
Nid Height |
23 |
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.
Sd Noname 20