Sd Noname 270 Reservoir Report
Nearby: Sd Noname 271 Sd Noname 272
Last Updated: December 6, 2025
Sd Noname 270 is a privately owned dam located in Haakon, South Dakota, along the TR-Cheyenne River.
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Summary
Built in 1951 by the Natural Resources Conservation Service, this earth dam stands at a height of 15 feet and has a length of 300 feet, providing a storage capacity of 60 acre-feet. Despite being classified as having a low hazard potential, the dam 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 integrity.
This South Dakota dam plays a crucial role in water resource management, with a maximum discharge capacity of 900 cubic feet per second. While the condition of Sd Noname 270 is currently rated as "Not Rated," regular inspections are conducted to monitor its structural integrity. The dam's emergency action plan status, risk assessment, and inundation maps preparedness remain unknown, highlighting areas for potential improvement in emergency preparedness and response.
Representing an important piece of water infrastructure in the region, Sd Noname 270 serves as a key asset for flood control and water storage along the Cheyenne River. As climate change impacts continue to pose challenges to water resource management, ensuring the safety and functionality of dams like Sd Noname 270 is essential for protecting communities and ecosystems downstream. Ongoing monitoring and maintenance efforts will be crucial in safeguarding this critical infrastructure for future generations.
Year Completed |
1951 |
Dam Length |
300 |
Dam Height |
15 |
River Or Stream |
TR-CHEYENNE RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
60 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
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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 270