Sd Noname 129 Reservoir Report
Nearby: Sd Noname 27 Sd Noname 21
Last Updated: December 5, 2025
Sd Noname 129 is a privately owned dam located in Haakon, South Dakota, along the TRIB-GRINDSTONE CREEK.
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Summary
This Earth-type dam stands at a height of 20 feet and has a length of 480 feet, with a storage capacity of 112 acre-feet. Completed in 1958, this dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and undergoes regular inspections, enforcement, and permitting processes to ensure its safety and compliance with state regulations.
Despite its low hazard potential and current "Not Rated" condition assessment, Sd Noname 129 remains a crucial water resource structure in the region, providing a maximum discharge of 3150 cubic feet per second and storing 32 acre-feet of water at normal levels. With its primary purpose and specific design details undisclosed, this dam serves as a vital component for water management and flood control in the area, contributing to the overall water resource infrastructure of South Dakota.
Managed by a private owner and located within the St. Paul District of the US Army Corps of Engineers, Sd Noname 129 plays a key role in water resource management and climate resilience efforts in the region. As a regulated structure with a history dating back to the mid-20th century, this dam represents a significant piece of South Dakota's water infrastructure, ensuring the safety and sustainability of the surrounding community and ecosystem through its storage capacity and discharge capabilities.
Year Completed |
1958 |
Dam Length |
480 |
Dam Height |
20 |
River Or Stream |
TRIB-GRINDSTONE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
112 |
Hazard Potential |
Low |
Nid Height |
20 |
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 129